| Description | Date | Identifier | |
| Modification to the Stromberg 25/30 carburetter to prevent the choke from jamming due to backfire. | 19th Aug 1938 | Box 121 \ 1 scan0025 | |
| Letter to New Hudson Ltd. regarding the failure of a Bentley rear brake adjuster spindle due to defective material and heat treatment. | 23th Aug 1938 | Box 121 \ 1 scan0026 | |
| Letter from Bendix regarding design suggestions for an experimental two leading shoe brake system. | 23th Aug 1938 | Box 121 \ 1 scan0027 | |
| Letter from Bendix Limited regarding a quotation for experimental equipment. | 24th Aug 1938 | Box 121 \ 1 scan0028 | |
| Letter from Bendix Limited requesting a copy of brake arrangement drawing No.NSCH.5178. | 24th Aug 1938 | Box 121 \ 1 scan0029 | |
| Letter from supplier New-Hudson Ltd concerning a failed rear brake adjuster spindle and proposed improvements. | 25th Aug 1938 | Box 121 \ 1 scan0030 | |
| Letter from Bendix regarding the application of external hydraulic cylinders for brakes. | 26th Aug 1938 | Box 121 \ 1 scan0031 | |
| Letter from Bendix Limited regarding the design and quotation for a hydraulic and mechanical brake system. | 26th Aug 1938 | Box 121 \ 1 scan0032 | |
| Letter from New-Hudson Ltd. regarding the enclosure of two adjuster spindles for testing. | 29th Aug 1938 | Box 121 \ 1 scan0033 | |
| Letter to New Hudson Ltd. regarding the testing of two adjuster spindles. | 31th Aug 1938 | Box 121 \ 1 scan0034 | |
| Broken New Hudson expander housing for B.III and B.50 brakes. | 1st Sep 1938 | Box 121 \ 1 scan0035 | |
| Letter to New-Hudson Ltd. regarding a Girling brake expander housing failure and the provision of new, strengthened design drawings. | 1st Sep 1938 | Box 121 \ 1 scan0036 | |
| Letter from New-Hudson Ltd acknowledging receipt of a letter and blueprints for a revised design on Expander Housings. | 2nd Sep 1938 | Box 121 \ 1 scan0037 | |
| Letter to Bendix Ltd. regarding drawing N.Sch.5178 and the purchase of brake units. | 5th Sep 1938 | Box 121 \ 1 scan0038 | |
| Letter from Bendix Limited regarding the progress on a set of experimental brakes and clarifying the purchase terms. | 6th Sep 1938 | Box 121 \ 1 scan0039 | |
| Letter from Bendix Limited concerning modifications to a brake with a flat torque plate and enclosing related drawings. | 7th Sep 1938 | Box 121 \ 1 scan0040 | |
| Laboratory analysis of a new spindle for Bentley III & B50 rear brakes, detailing its material composition and hardness tests. | 12th Sep 1938 | Box 121 \ 1 scan0041 | |
| The results of a reheat treatment, noting changes in fracture, hardness, and microstructure. | 12th Sep 1938 | Box 121 \ 1 scan0042 | |
| Laboratory report on a longitudinal section through a spindle for Bentley III & B50 rear brakes, showing a streamer of free ferrite. | 12th Sep 1938 | Box 121 \ 1 scan0043 | |
| Letter from Automotive Products Company Ltd. confirming a free-of-charge order for wheel cylinders. | 13th Sep 1938 | Box 121 \ 1 scan0044 | |
| Letter to New Hudson Ltd. concerning the failure of an adjuster spindle due to poor quality steel from their supplier. | 13th Sep 1938 | Box 121 \ 1 scan0045 | |
| Letter from New-Hudson regarding a laboratory report on new adjuster spindles and their plan to investigate with the steel supplier. | 15th Sep 1938 | Box 121 \ 1 scan0046 | |
| Secret memorandum on the development and application of hydraulic front brakes for models B.III, B.50, and Wraith 80. | 16th Sep 1938 | Box 121 \ 1 scan0047 | |
| The application of hydraulic front Girling brakes to B.111, B.50, and Wraith 80 models. | 19th Sep 1938 | Box 121 \ 1 scan0048 | |
| Modifications to the brake leverages for B.111 and B.50 chassis. | 20th Sep 1938 | Box 121 \ 1 scan0049 | |
| Scheme to cure servo judders on Bentley III and 50 models by fitting a front brake damper. | 22th Sep 1938 | Box 121 \ 1 scan0050 | |
| Modifications to the hand brake mechanism for B.111 and B.50 chassis to increase travel. | 22th Sep 1938 | Box 121 \ 1 scan0051 | |
| Letter from New-Hudson Ltd explaining a production error regarding an Adjuster Spindle. | 27th Sep 1938 | Box 121 \ 1 scan0052 | |
| Letter from New Hudson Limited, enclosing a report and photograph from Premier Steel Co. Ltd. | 27th Sep 1938 | Box 121 \ 1 scan0053 | |
| Letter to New Hudson Ltd. regarding production supplies, a failed expander housing, and die casting alloys. | 29th Sep 1938 | Box 121 \ 1 scan0054 | |
| Letter to Automotive Products Co. Ltd. regarding drawings and specifications for a hydraulic unit. | 30th Sep 1938 | Box 121 \ 1 scan0055 | |
| Letter from New-Hudson Ltd. concerning sample spindles and a laboratory report on expander housing alloy. | 30th Sep 1938 | Box 121 \ 1 scan0056 | |
| Letter from Automotive Products Company Ltd regarding prints of a hydraulic unit. | 3rd Oct 1938 | Box 121 \ 1 scan0057 | |
| Proposal for substituting a rubber ring for the metallic fitting on the front brake dust cover for Bentley 111 and 50 models. | 3rd Oct 1938 | Box 121 \ 1 scan0058 | |
| Modifications to the rear brakes for Bentley 111 and 50 models. | 4th Oct 1938 | Box 121 \ 1 scan0059 | |
| Modifications to the rear brakes intermediate shaft, equaliser, and rear gusset stay. | 10th Oct 1938 | Box 121 \ 1 scan0060 | |
| Letter from New-Hudson Ltd. regarding the enclosure of two sample spindles made of 3% Nickel. | 10th Oct 1938 | Box 121 \ 1 scan0061 | |
| Letter to Bendix Ltd. arranging a meeting to discuss a two-leading shoe brake. | 11th Oct 1938 | Box 121 \ 1 scan0062 | |
| Letter from Automotive Products Company Ltd regarding brake equipment drawings and recommendation RM.1952. | 12th Oct 1938 | Box 121 \ 1 scan0063 | |
| Examination of a new spindle for Bentley III & B.50 rear brakes, questioning its material and structure. | 13th Oct 1938 | Box 121 \ 1 scan0064 | |
| Letter to The Hoffman Manufacturing Co. enquiring about a replacement sealed ball race for a servo motor. | 20th Oct 1938 | Box 121 \ 1 scan0065 | |
| Order be placed with Bendix Ltd. for Bentley 2 leading shoe brakes. | 21th Oct 1938 | Box 121 \ 1 scan0066 | |
| The modification and re-issue of a drawing for a water seal on a brake adjuster. | 22th Oct 1938 | Box 121 \ 1 scan0067 | |
| Letter to the Institution of Automobile Engineers discussing an interim report on brake squeak and related friction/temperature curves. | 24th Oct 1938 | Box 121 \ 1 scan0068 | |
| Page 2 of a letter to the Institution of Automobile Engineers discussing brake squeak and μ-speed curves. | 24th Oct 1938 | Box 121 \ 1 scan0069 | |
| Letter to Bendix Ltd. regarding an order for a pair of two leading shoe brakes for testing. | 27th Oct 1938 | Box 121 \ 1 scan0070 | |
| Letter from New-Hudson Ltd. enclosing a blueprint of a new Girling Brake with two leading shoes. | 27th Oct 1938 | Box 121 \ 1 scan0071 | |
| Letter from Bendix Limited concerning experimental brakes and expressing disappointment with a production decision. | 28th Oct 1938 | Box 121 \ 1 scan0072 | |
| Letter from the Institution of Automobile Engineers discussing experiments on brake squeak, friction, and speed. | 9th Nov 1938 | Box 121 \ 1 scan0073 | |
| Continuation of a report detailing the testing methodology for brake lining friction and temperature. | 9th Nov 1938 | Box 121 \ 1 scan0074 | |
| Letter discussing brake lining tests, coefficient of friction, and the issue of squeaking. | 9th Nov 1938 | Box 121 \ 1 scan0075 | |
| Letter to Automotive Products Co. Ltd. requesting an installation drawing for a Hill-Holder system for cars with Lockheed brakes. | 12th Nov 1938 | Box 121 \ 1 scan0076 | |
| Letter from Bendix Limited chasing an order for Dust Covers for 2.L.S. Brakes. | 15th Nov 1938 | Box 121 \ 1 scan0077 | |
| Letter forwarding an installation and assembly drawing for a Lockheed Hill-Holder. | 16th Nov 1938 | Box 121 \ 1 scan0078 | |
| Letter to Bendix Ltd. following up on a previous letter regarding 2.L.S. brakes and inviting Capt. J.S. Irving for a discussion. | 18th Nov 1938 | Box 121 \ 1 scan0079 | |
| Letter from Bendix Limited regarding the temporary absence of Captain Irving and proposing a meeting with their Chief Engineer. | 21th Nov 1938 | Box 121 \ 1 scan0080 | |
| Letter to Bendix Limited regarding the illness of Capt. Irving and postponing a business discussion. | 24th Nov 1938 | Box 121 \ 1 scan0081 | |
| Letter from Bendix Limited to arrange a visit from their Joint General Manager. | 25th Nov 1938 | Box 121 \ 1 scan0082 | |
| Letter to Bendix Ltd. concerning a patent query over a hydraulically-operated brake unit. | 30th Nov 1938 | Box 121 \ 1 scan0083 | |
| Hydraulic brake details for Bendix Ltd and proposed improvements to shock dampers for the 8.B.V model. | 30th Nov 1938 | Box 121 \ 1 scan0084 | |
| Letter to Bendix Ltd. regarding a potential patent infringement for a brake operation unit. | 30th Nov 1938 | Box 121 \ 1 scan0085 | |
| Letter from Bendix Limited regarding the supply of parts for two-leading-shoe brake assemblies. | 6th Dec 1938 | Box 121 \ 1 scan0086 | |
| Letter to Bendix Ltd confirming the dispatch of requested experimental parts. | 8th Dec 1938 | Box 121 \ 1 scan0087 | |
| Letter to New-Hudson Ltd. regarding a hydraulic unit, materials, and patents for brake wedges. | 9th Dec 1938 | Box 121 \ 1 scan0088 | |
| Listing outstanding work and actions required for various brake systems and components. | 13th Dec 1938 | Box 121 \ 1 scan0089 | |
| Listing car component issues and required actions. | 13th Dec 1938 | Box 121 \ 1 scan0090 | |
| Request to clean, paint and despatch various parts to Bendix Ltd for a two-leading shoe brake. | 13th Dec 1938 | Box 121 \ 1 scan0091 | |
| Letter from New-Hudson Ltd discussing patent coverage for hydraulic and wedge operating brakes and proposing tests for a new Two Leading Shoe Brake. | 13th Dec 1938 | Box 121 \ 1 scan0092 | |
| List of outstanding work items and required actions for various brake systems. | 13th Dec 1938 | Box 121 \ 1 scan0093 | |
| Listing vehicle issues and corresponding instructions or queries. | 13th Dec 1938 | Box 121 \ 1 scan0094 | |
| Letter from Bendix confirming that drawing SCD1039 for a hydraulic-wedge roller operation does not infringe on their patents. | 19th Dec 1938 | Box 121 \ 1 scan0095 | |
| Letter from Automotive Products Company Ltd regarding a telephone conversation about an order for 'KEENOL' Grease. | 22th Dec 1938 | Box 121 \ 1 scan0096 | |
| Letter to Automotive Products Ltd. concerning the design and supply of master cylinders. | 29th Dec 1938 | Box 121 \ 1 scan0097 | |
| Requesting a drawing alteration for Lockheed Girling hydraulic brake cylinders due to insufficient bolt thread depth. | 30th Dec 1938 | Box 121 \ 1 scan0098 | |
| Letter from Automotive Products Company Ltd regarding the availability of a 1 1/4' Barrel Type Master Cylinder. | 30th Dec 1938 | Box 121 \ 1 scan0099 | |
| Letter from Automotive Products Company Ltd regarding installation issues for the Lockheed braking system on the 30 HP Experimental Chassis. | 3rd Jan 1939 | Box 121 \ 1 scan0100 | |
| Letter from Automotive Products Company Limited regarding the modification of a bottom radiator water pipe for clearance. | 3rd Jan 1939 | Box 121 \ 1 scan0101 | |
| Required work to be tackled on vehicle components such as suspension, springs, and the chassis frame. | 5th Jan 1939 | Box 121 \ 1 scan0102 | |
| Modifications and testing for various chassis and suspension components. | 5th Jan 1939 | Box 121 \ 1 scan0103 | |
| Noise tests, engine mounting, and component testing for the Wraith II model. | 5th Jan 1939 | Box 121 \ 1 scan0104 | |
| Technical report on lubrication and shock damper tests and modifications for various car models. | 5th Jan 1939 | Box 121 \ 1 scan0105 | |
| 'C' Series shock dampers, Silver Wraith brakes, and new servo testing. | 5th Jan 1939 | Box 121 \ 1 scan0106 | |
| Letter from New-Hudson Ltd requesting information regarding Girling Brakes supplied for testing. | 17th Jan 1939 | Box 121 \ 1 scan0107 | |
| Letter to Automotive Products Co. Ltd. regarding modifications to hydraulic brakes on an experimental chassis. | 21th Jan 1939 | Box 121 \ 1 scan0108 | |
| Letter to New Hudson Ltd. requesting a design and quotation for two leading shoe brakes. | 26th Jan 1939 | Box 121 \ 1 scan0109 | |
| Letter to New Hudson Ltd. concerning the diameter of shoes for a 12' drum. | 26th Jan 1939 | Box 121 \ 1 scan0110 | |
| Letter to New Hudson Ltd. requesting a quotation for 8 brake shoes. | 27th Jan 1939 | Box 121 \ 1 scan0111 | |
| Letter from New-Hudson Ltd discussing brake shoe and drum diameter specifications. | 27th Jan 1939 | Box 121 \ 1 scan0112 | |
| Request for blueprints and a list of standard parts for testing hydraulic braking systems on all chassis. | 27th Jan 1939 | Box 121 \ 1 scan0113 | |
| Letter from the Experimental Department to Messrs. Hew Hudson Ltd. regarding brake shoe and drum dimensions. | 28th Jan 1939 | Box 121 \ 1 scan0114 | |
| Letter from New-Hudson Ltd regarding brake shoe and lining specifications. | 30th Jan 1939 | Box 121 \ 1 scan0115 | |
| Letter from New-Hudson Ltd providing an official quotation for brake shoes. | 30th Jan 1939 | Box 121 \ 1 scan0116 | |
| Request to issue an official order for 8 brake shoes to New Hudson Ltd. | 31th Jan 1939 | Box 121 \ 1 scan0117 | |
| Request for a second set of parts for a hydraulic cylinder used for testing brakes. | 2nd Feb 1939 | Box 121 \ 1 scan0118 | |
| Cover letter to New Hudson Ltd. enclosing steel specification 2072. | 8th Feb 1939 | Box 121 \ 1 scan0119 | |
| Letter from New-Hudson Ltd regarding proposals for Girling Brakes. | 10th Feb 1939 | Box 121 \ 1 scan0120 | |
| Letter from New-Hudson Ltd. regarding the use of their standard material P.259 for expander cones. | 10th Feb 1939 | Box 121 \ 1 scan0121 | |
| Letter to New Hudson Ltd. from the Experimental Department regarding the trial of their leading shoe brakes. | 17th Feb 1939 | Box 121 \ 1 scan0122 | |
| Letter from New-Hudson Ltd. regarding a drawing for a brake shoe with tolerances for a new T section. | 17th Feb 1939 | Box 121 \ 1 scan0123 | |
| Letter from New-Hudson Ltd concerning an order for brake shoes and carriers. | 18th Feb 1939 | Box 121 \ 1 scan0124 | |
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