| Description | Date | Identifier | |
| Letter from Bendix-Perrot Brakes Ltd. requesting an opportunity to demonstrate their 4-wheel brakes. | 28th Sep 1928 | Box 120 \ 3 scan0011 | |
| Letter to Bendix-Perrot Brakes Ltd. declining a demonstration of their braking system. | 29th Sep 1928 | Box 120 \ 3 scan0012 | |
| Letter from Bendix-Perrot Brakes Ltd. discussing the supply and fitting of front-wheel brakes for early Rolls-Royce chassis. | 1st Oct 1928 | Box 120 \ 3 scan0013 | |
| Letter to Bendix-Perrot Brakes Ltd. explaining the refusal to fit front wheel brakes to older Silver Ghost cars without significant alterations. | 3rd Oct 1928 | Box 120 \ 3 scan0014 | |
| Letter from Bendix-Perrot Brakes Ltd. discussing the proposed fitting of their front wheel brakes to the Silver Ghost chassis. | 4th Oct 1928 | Box 120 \ 3 scan0015 | |
| Letter to Bendix-Perrot Brakes Ltd. regarding the non-approval of the Whitehead system for Silver Ghost type cars. | 5th Oct 1928 | Box 120 \ 3 scan0016 | |
| Letter from Bendix-Perrot Brakes Ltd. proposing the installation of their front-wheel brakes on the 'Silver Ghost' chassis. | 25th Oct 1928 | Box 120 \ 3 scan0017 | |
| Letter to Bendix-Perrot Brakes Ltd. declining the conversion of Silver Ghost cars to front-wheel brakes. | 27th Oct 1928 | Box 120 \ 3 scan0018 | |
| Suggesting the fitment of a supplementary Proney brake to allow for low-speed testing of Phantom engines. | 1st Nov 1928 | Box 120 \ 3 scan0019 | |
| Inquiry about a new patent brake lever under test, upon which an order for a 40/50 HP Phantom chassis depends. | 1st Oct 1928 | Box 120 \ 3 scan0020 | |
| Cover note attaching a copy of a letter sent to Messrs. W.H. Smith. | 2nd Oct 1928 | Box 120 \ 3 scan0021 | |
| The state of hydraulic brakes in the U.S.A., including discussions with Lockheed and Chrysler. | 15th Feb 1932 | Box 120 \ 3 scan0022 | |
| Report comparing a Lockhead brake system to a mechanical system, noting leakage, weight, and efficiency. | 11th Aug 1932 | Box 120 \ 3 scan0023 | |
| Letter from Bendix-Perrot Brakes Ltd. regarding sample brake shoes and clutch control. | 11th Aug 1932 | Box 120 \ 3 scan0024 | |
| Letter to Bendix-Perrot Brakes Ltd. concerning observations on brake shoes and unsuccessful tests on clutch control plungers. | 12th Aug 1932 | Box 120 \ 3 scan0025 | |
| Letter to Automotive Products Ltd. regarding low efficiency found during tests on a hydraulic brake transmission fitted to a Morris car. | 15th Oct 1932 | Box 120 \ 3 scan0026 | |
| Letter from Automotive Products Company regarding testing procedures for their Lockheed Hydraulic Braking System. | 17th Oct 1932 | Box 120 \ 3 scan0027 | |
| Letter to the Automotive Products Company detailing brake system tests carried out on a 1932 Morris Cowley. | 18th Oct 1932 | Box 120 \ 3 scan0028 | |
| Letter from Automotive Products Company discussing the efficiency of their hydraulic braking system and potential mechanical losses. | 20th Oct 1932 | Box 120 \ 3 scan0029 | |
| Continuation page of a letter from Automotive Products Company. | 20th Oct 1932 | Box 120 \ 3 scan0030 | |
| Letter from Automotive Products Company regarding a test report on the Lockheed Hydraulic Braking System. | 15th Nov 1932 | Box 120 \ 3 scan0031 | |
| Progress report on investigations into the working efficiency of the Lockheed hydraulic brake system. | 9th Nov 1932 | Box 120 \ 3 scan0032 | |
| Progress report on investigations to ascertain the working efficiency of the Lockheed hydraulic brake system. | 9th Nov 1932 | Box 120 \ 3 scan0033 | |
| Schematic of a rig for testing the working efficiency of the Lockheed hydraulic brake system. | 23th Nov 1932 | Box 120 \ 3 scan0034 | |
| Letter to The Lockheed Hydraulic Brake Co. Ltd. thanking them for information and confirming their system's efficiency. | 23th Nov 1932 | Box 120 \ 3 scan0035 | |
| Analysis of hydraulic brake layouts, comparing servo-assisted and direct braking systems. | 21th Dec 1932 | Box 120 \ 3 scan0036 | |
| Lockheed's attempts at an automatic ratchet brake adjustment system and associated specifications. | 21th Dec 1932 | Box 120 \ 3 scan0037 | |
| Letter to Lockheed Hydraulic Braking System requesting a spring drive clutch centre for trial. | 21th Dec 1932 | Box 120 \ 3 scan0038 | |
| Official order for a spring drive clutch centre from Lockheed Brakes Ltd. | 21th Dec 1932 | Box 120 \ 3 scan0039 | |
| Letter from consulting engineers proposing a new composite steel brake drum and offering to supply an experimental set. | 1st Apr 1933 | Box 120 \ 3 scan0040 | |
| Specification for a composite steel brake drum under the Holden & Hunt Patent. | 1st May 1938 | Box 120 \ 3 scan0041 | |
| Article detailing a new method for constructing composite steel brake drums. | 20th Jan 1933 | Box 120 \ 3 scan0042 | |
| Letter from Pratt & Manley detailing the test results for a Composite Steel Brake Drum. | 15th Jun 1933 | Box 120 \ 3 scan0043 | |
| Article detailing a new method for the construction of composite steel brake drums, reprinted from 'The Light Car and Cyclecar' magazine. | 20th Jan 1933 | Box 120 \ 3 scan0044 | |
| Letter to Messrs Pratt & Manley postponing the testing of brake drums for six months. | 16th Jun 1933 | Box 120 \ 3 scan0045 | |
| Letter from New-Hudson Ltd following up on a telephone call regarding a Girling Brake. | 10th Oct 1933 | Box 120 \ 3 scan0046 | |
| Letter from New-Hudson Ltd. requesting an interview to discuss the Girling Brake system. | 26th Oct 1933 | Box 120 \ 3 scan0047 | |
| Letter from the Experimental Dept. to New-Hudson Ltd. arranging a meeting to see their representative regarding the Girling Brake. | 27th Oct 1933 | Box 120 \ 3 scan0048 | |
| Letter from New-Hudson Ltd. confirming a meeting to discuss the Girling Brake. | 30th Oct 1933 | Box 120 \ 3 scan0049 | |
| Letter from New-Hudson Ltd to Rolls-Royce concerning their Girling Brake system. | 1st Nov 1933 | Box 120 \ 3 scan0050 | |
| The second page of a letter from New-Hudson, Ltd. regarding a contract for Air Screw Hubs. | 1st Nov 1933 | Box 120 \ 3 scan0051 | |
| Letter to Captain Wilkes of The Rover Motor Car Co. Ltd. expressing interest in testing the Girling Brake system. | 3rd Nov 1933 | Box 120 \ 3 scan0052 | |
| Letter to Messrs New-Hudson Ltd. regarding the trial of the Girling Brake system. | 3rd Nov 1933 | Box 120 \ 3 scan0053 | |
| Performance and features of the Girling Brake system. | 3rd Nov 1933 | Box 120 \ 3 scan0054 | |
| Letter from Pratt & Manley regarding the performance and adoption of composite steel brake drums. | 3rd Nov 1933 | Box 120 \ 3 scan0055 | |
| Letter from The Rover Company Ltd. acknowledging receipt of a letter dated November 3rd. | 4th Nov 1933 | Box 120 \ 3 scan0056 | |
| Potential of the Girling Brake and a proposed visit to the Rover Co. to learn more. | 6th Nov 1933 | Box 120 \ 3 scan0057 | |
| Letter from New-Hudson Ltd regarding the potential fitting of a Girling Brake to a chassis. | 6th Nov 1933 | Box 120 \ 3 scan0058 | |
| Letter from the Experimental Dept. to Captain Wilkes of The Rover Motor Co. Ltd. confirming a meeting. | 7th Nov 1933 | Box 120 \ 3 scan0059 | |
| Letter to The Rover Motor Co. Ltd. regarding information on the Girling Brake and a car trial. | 9th Nov 1933 | Box 120 \ 3 scan0060 | |
| Visit to the Rover factory to investigate their Girling Brake system. | 9th Nov 1933 | Box 120 \ 3 scan0061 | |
| Observations on vehicle component performance, including free wheel cams, chassis vibration, and steering systems. | 9th Nov 1933 | Box 120 \ 3 scan0062 | |
| Visit to Rovers, discussing the Girling Brake, chassis shimmy, and bonnet movement on a 20/25 Trials car. | 14th Nov 1933 | Box 120 \ 3 scan0063 | |
| Dissatisfaction with the current brake system and outlining a policy for future development, referencing the Girling Brake and a visit to Rovers. | 15th Nov 1933 | Box 120 \ 3 scan0064 | |
| Adoption of Girling brake systems and methods to improve chassis rigidity to reduce oscillation. | 15th Nov 1933 | Box 120 \ 3 scan0065 | |
| Page 3 of a document discussing an investigation into a scheme concerning chassis movement. | 15th Nov 1933 | Box 120 \ 3 scan0066 | |
| Girling brake, a visit to Rovers, and a solution for oscillation on the 20/25 trials car. | 16th Nov 1933 | Box 120 \ 3 scan0067 | |
| Letter from New-Hudson Ltd offering a free fitting and demonstration of their Girling Universal Brake system. | 22th Nov 1933 | Box 120 \ 3 scan0068 | |
| Advertisement from 'The Autocar' magazine for the New Rover 'Twelve' car, featuring performance data. | 25th Aug 1933 | Box 120 \ 3 scan0069 | |
| Letter from Desmo Limited regarding a proposed design for a Brake Adjustment cover. | 5th Dec 1933 | Box 120 \ 3 scan0070 | |
| Letter to Messrs Desmo Ltd. regarding a design modification for brake adjuster covers. | 7th Dec 1933 | Box 120 \ 3 scan0071 | |
| Letter to Messrs Lake & Elliott Ltd. requesting their opinion on the best rivet to prevent brake drum scoring. | 7th Dec 1933 | Box 120 \ 3 scan0072 | |
| Letter from the Experimental Dept. requesting advice on the best type of rivet to prevent the scoring of brake drums. | 7th Dec 1933 | Box 120 \ 3 scan0073 | |
| Letter discussing brake drum tests, comparing brass and aluminium rivets, and mentioning patent rivet-less brake shoes. | 8th Dec 1933 | Box 120 \ 3 scan0074 | |
| Letter from supplier Desmo regarding design modifications and tooling costs for brake adjustment covers. | 16th Dec 1933 | Box 120 \ 3 scan0075 | |
| Letter to Messrs. Desmo Ltd. regarding rubber covers for a brake adjustment mechanism and requesting a quotation. | 29th Dec 1933 | Box 120 \ 3 scan0076 | |
| Drawing of oil-resisting rubber covers for brake adjusters. | 4th Dec 1933 | Box 120 \ 3 scan0077 | |
| Letter from consulting engineers regarding the use and adoption of composite steel brake drums by other manufacturers. | 29th Dec 1933 | Box 120 \ 3 scan0078 | |
| Letter declining an offer to test composite steel brake drums. | 1st Jan 1934 | Box 120 \ 3 scan0079 | |
| Letter from New-Hudson Ltd proposing a free trial of their Girling Braking System on a chassis. | 12th Feb 1934 | Box 120 \ 3 scan0080 | |
| Letter to New-Hudson Limited declining to provide a chassis for fitting a Girling Brake System. | 14th Feb 1934 | Box 120 \ 3 scan0081 | |
| Letter from Bowden (Engineers) Ltd regarding test results for sample Brake Cable Assemblies. | 14th Mar 1934 | Box 120 \ 3 scan0082 | |
| Test results graph for T.7 & T.10 outer conduits with an inner member, plotting load (LBS) against displacement (M/M). | 13th Mar 1934 | Box 120 \ 3 scan0083 | |
| Graph plotting load in pounds (LBS) against extension in millimeters (M/M) for a conduit and inner member assembly. | 12th Mar 1934 | Box 120 \ 3 scan0084 | |
| Graph showing a load test on a heavy outer conduit with an inner member. | 12th Mar 1934 | Box 120 \ 3 scan0085 | |
| Performance test graph for an outer conduit and inner member assembly. | 12th Mar 1934 | Box 120 \ 3 scan0086 | |
| Diagram illustrating the layout and operation of a Bowden wire brake system. | 22th Jun 1931 | Box 120 \ 3 scan0087 | |
| Letter from New-Hudson Ltd proposing to fit their Girling Braking System to a chassis for free. | 17th Apr 1934 | Box 120 \ 3 scan0088 | |
| Demonstration and the technical workings of Warner electric brakes. | 28th Sep 1934 | Box 120 \ 3 scan0089 | |
| The control and performance of a braking system on a Commer lorry. | 26th Oct 1934 | Box 120 \ 3 scan0090 | |
| Letter from Pratt & Manley regarding 'H & H' Composite Steel Brake Drums. | 26th Oct 1934 | Box 120 \ 3 scan0091 | |
| Promotional brochure for Holden & Hunt high tensile steel brake drums and welding services. | 26th Oct 1934 | Box 120 \ 3 scan0092 | |
| Specification sheet for H&H steel brake drums, detailing materials, construction, and performance tests. | 12th Nov 1934 | Box 120 \ 3 scan0093 | |
| Letter to Captain Wilks of The Rover Co. Ltd. asking for clarification on the performance and design of Girling brakes. | 12th Nov 1934 | Box 120 \ 3 scan0094 | |
| Letter from The Rover Company Ltd responding to questions about Girling Brakes. | 13th Nov 1934 | Box 120 \ 3 scan0095 | |
| Letter from The Rover Company to Rolls-Royce detailing specifics on brake wedge angles and pull-off springs. | 13th Nov 1934 | Box 120 \ 3 scan0096 | |
| Diagram illustrating the spring pressure on Girling brake shoes. | 13th Nov 1934 | Box 120 \ 3 scan0097 | |
| Requesting the dispatch of a loaned wedge back to The Rover Company Ltd. | 14th Nov 1934 | Box 120 \ 3 scan0098 | |
| Letter to The Rover Company regarding the adjustment and bedding of Girling brakes. | 14th Nov 1934 | Box 120 \ 3 scan0099 | |
| Letter from The Rover Company Ltd to Rolls-Royce Ltd discussing brake adjustment and shoe bedding. | 15th Nov 1934 | Box 120 \ 3 scan0100 | |
| Letter from New-Hudson Ltd. proposing the fitment of Girling Brakes to future models. | 21th Nov 1934 | Box 120 \ 3 scan0101 | |
| Letter to New Hudson Ltd. regarding fitting Girling Brakes to an experimental chassis. | 24th Nov 1934 | Box 120 \ 3 scan0102 | |
| Letter from New-Hudson Ltd arranging a meeting for Thursday, December 6th at 11 a.m. | 27th Nov 1934 | Box 120 \ 3 scan0103 | |
| Letter to New-Hudson Ltd. to arrange a meeting to discuss fitting Girling brakes to a chassis. | 29th Nov 1934 | Box 120 \ 3 scan0104 | |
| Letter from New-Hudson Ltd confirming a rescheduled meeting and discussing a future demonstration of a Lagonda car. | 6th Dec 1934 | Box 120 \ 3 scan0105 | |
| Letter from New-Hudson Ltd concerning the fitting and testing of Girling Brakes on a Bentley chassis. | 7th Dec 1934 | Box 120 \ 3 scan0106 | |
| Letter to Messrs. New-Hudson Ltd. regarding a 'Shoe and Expander set-up' and axle tests. | 8th Dec 1934 | Box 120 \ 3 scan0107 | |
| Discussion on brake system inefficiencies with the Girling Brake company. | 8th Dec 1934 | Box 120 \ 3 scan0108 | |
| Letter from consulting engineers Pratt & Manley regarding the features and benefits of their composite steel brake drum. | 8th Dec 1934 | Box 120 \ 3 scan0109 | |
| Letter to Messrs. Pratt & Manley regarding the New Hudson Company's Girling Brake layout for a Bentley. | 10th Dec 1934 | Box 120 \ 3 scan0110 | |
| | | | |
