| Description | Date | Identifier | |
| Two new schemes to fix seizures of rear brake actuating shafts on 20-25 HP, 25-30 HP, and Bentley models. | 22th Dec 1937 | Box 120 \ 2 scan0259 | |
| Letter to a supplier regarding the failure of a 'Gaco' rubber bush and the preference for 'Neoprene' rubbers. | 1st Jan 1938 | Box 120 \ 2 scan0260 | |
| Letter from George Angus & Co Ltd discussing the hardness, quality, and pricing of 'Gaco' bushes and experimental buffers. | 4th Jan 1938 | Box 120 \ 2 scan0261 | |
| Letter from George Angus & Co. discussing Order No.51136 for Buffers, the cost of a mould, and comparing 'Gaco' and 'Neoprene' materials. | 14th Jan 1938 | Box 120 \ 2 scan0262 | |
| Arranging the return of a Girling 4 shoe brake assembly to New Hudson Ltd. | 14th Jan 1938 | Box 120 \ 2 scan0263 | |
| Letter to Messrs. New-Hudson Ltd. regarding the examination and return of a 4 shoe brake assembly. | 14th Jan 1938 | Box 120 \ 2 scan0264 | |
| Letter from New-Hudson Ltd. regarding the receipt and potential supply of a Four Shoe Brake assembly. | 18th Jan 1938 | Box 120 \ 2 scan0265 | |
| Requesting the purchase of a Ford Model T trembler coil for a test rig time marker. | 19th Jan 1938 | Box 120 \ 2 scan0266 | |
| Request to manufacture two recording pens for a brake test apparatus. | 20th Jan 1938 | Box 120 \ 2 scan0267 | |
| Solution for inefficient brakes on Bentley and 25/30 HP models by modifying servo countershaft levers. | 2nd Feb 1938 | Box 120 \ 2 scan0268 | |
| Note on adjusting pedal leverage and pressure. | 2nd Feb 1938 | Box 120 \ 2 scan0269 | |
| Stating that production levers are not to be made in the Experimental Department. | 4th Feb 1938 | Box 120 \ 2 scan0270 | |
| The production and supply of brake levers for 25/30 & Bentley cars. | 2nd Mar 1938 | Box 120 \ 2 scan0271 | |
| Letter to a supplier regarding a test car brake failure and an urgent request for new expander units with a dimensional change. | 5th Feb 1938 | Box 120 \ 2 scan0272 | |
| Letter from New-Hudson Ltd. concerning a broken pull rod and six expander units for drawing GCD.469. | 8th Feb 1938 | Box 120 \ 2 scan0273 | |
| Inquiry to Ransome & Marles Bearing Co. Ltd. about a ball race for a brake servo motor. | 10th Feb 1938 | Box 120 \ 2 scan0274 | |
| Girling 4 shoe brake, its weaknesses, proposed improvements, and potential patentability. | 11th Feb 1938 | Box 120 \ 2 scan0275 | |
| Letter to The New Hudson Co. Ltd. regarding a scheme for fixing holes in the expander housing. | 11th Feb 1938 | Box 120 \ 2 scan0276 | |
| Letter from New-Hudson Ltd. acknowledging suggested modifications to an expander housing and agreeing to proceed with sample units. | 12th Feb 1938 | Box 120 \ 2 scan0277 | |
| Request to order six expander units (3 pairs) for Girling Brakes on a Bentley II, to drawing GCD.482. | 14th Feb 1938 | Box 120 \ 2 scan0278 | |
| Letter to New Hudson Ltd. confirming details of an expander cone and placing an order for six units. | 14th Feb 1938 | Box 120 \ 2 scan0279 | |
| Letter from New-Hudson Ltd. enclosing a modified drawing, G.B. 3328, for an expander housing. | 14th Feb 1938 | Box 120 \ 2 scan0280 | |
| Letter to New Hudson Ltd. confirming dimensional changes for an expander housing referenced on print GB.3328. | 15th Feb 1938 | Box 120 \ 2 scan0281 | |
| Letter from New-Hudson Ltd regarding brake component specifications and a revised drawing. | 15th Feb 1938 | Box 120 \ 2 scan0282 | |
| Letter from New-Hudson Ltd. confirming they will machine expander housings and are enclosing a revised print. | 16th Feb 1938 | Box 120 \ 2 scan0283 | |
| Letter to Automotive Products Company Ltd. chasing an order for Lockheed brake components for an experimental Bentley car. | 17th Feb 1938 | Box 120 \ 2 scan0284 | |
| Letter from New-Hudson Ltd. regarding the supply of a blueprint for a standard 10 inch brake shoe. | 22th Feb 1938 | Box 120 \ 2 scan0285 | |
| Letter to New-Hudson Ltd. clarifying a request for a wider brake shoe for a 12' drum. | 23th Feb 1938 | Box 120 \ 2 scan0286 | |
| Use of BZ material for brake linings to resolve brake squeaks on customer cars. | 4th Mar 1938 | Box 120 \ 2 scan0287 | |
| Requirements and considerations for future brake designs, including hydraulic systems and independent suspension. | 8th Mar 1938 | Box 120 \ 2 scan0288 | |
| Future designs and improvements for vehicle brake systems. | 7th Mar 1938 | Box 120 \ 2 scan0289 | |
| Specifications for front brake drums and a note on creating an interchangeable design. | 7th Mar 1938 | Box 120 \ 2 scan0290 | |
| Adaptation of Girling type rear brakes on a semi-floating rear axle for Bentley 111 and 50 models. | 12th Mar 1938 | Box 120 \ 2 scan0291 | |
| Letter to New-Hudson Ltd. regarding a drawing of a four-shoe brake for an experimental car. | 21th Mar 1938 | Box 120 \ 2 scan0292 | |
| Letter to New-Hudson Ltd. requesting an alteration to a dimension on print GB.3328. | 24th Mar 1938 | Box 120 \ 2 scan0293 | |
| Letter from Automotive Products Company Ltd. sending data sheets for the Lockheed Gates Booster. | 24th Mar 1938 | Box 120 \ 2 scan0294 | |
| Letter from New Hudson Ltd. concerning a drawing revision for an expander housing. | 26th Mar 1938 | Box 120 \ 2 scan0295 | |
| Schematic showing the design and cross-sections of a Lockheed-Gates booster for a transmission type fluid brake system. | 12th Apr 1938 | Box 120 \ 2 scan0296 | |
| Scheme detailing modifications to the front brake operation for Bentley 111 and 50 models. | 12th Apr 1938 | Box 120 \ 2 scan0297 | |
| Follow-up letter from New-Hudson Ltd regarding the progress of fitting 200 Bentleys with Girling Rear Brakes. | 20th Apr 1938 | Box 120 \ 2 scan0298 | |
| Re-issue notification for drawing G.CD.616 concerning modifications to the Bentley 111 and 50 rear brake linkage. | 20th Apr 1938 | Box 120 \ 2 scan0299 | |
| Request to send a Birling Expander Unit to New Hudson Ltd. for examination. | 22th Apr 1938 | Box 120 \ 2 scan0300 | |
| Letter to New Hudson Ltd. regarding faults in a brake expander unit and the standardisation of brakes for a Bentley. | 22th Apr 1938 | Box 120 \ 2 scan0301 | |
| Page 2 of a letter to New Hudson Ltd. concerning the schedule for a model with Girling brakes. | 22th Apr 1938 | Box 120 \ 2 scan0302 | |
| Letter from New-Hudson Ltd discussing modifications to plungers, expander units, and dimensional changes. | 25th Apr 1938 | Box 120 \ 2 scan0303 | |
| Postscript clarifying that expander unit parts were machined freehand and that future production will adhere to print dimensions. | 25th Apr 1938 | Box 120 \ 2 scan0304 | |
| Outlining two alternative specifications for cast iron brake shoes. | 27th Apr 1938 | Box 120 \ 2 scan0305 | |
| Letter from Automotive Products Company Ltd forwarding an installation drawing for a Vauxhall-type Wheel Cylinder. | 29th Apr 1938 | Box 120 \ 2 scan0306 | |
| Letter to Automotive Products Ltd. requesting their installation engineer brings brake operating fluid for an upcoming visit. | 4th May 1938 | Box 120 \ 2 scan0307 | |
| Short message inquiring about the arrival of an installation engineer. | 4th May 1938 | Box 120 \ 2 scan0308 | |
| Letter from Automotive Products Company Ltd regarding the scheduling of an Installation Engineer's visit. | 4th May 1938 | Box 120 \ 2 scan0309 | |
| Modification to the B.50 and B.111 rear brakes involving a new 'Off' stop for the linkage. | 5th May 1938 | Box 120 \ 2 scan0310 | |
| Letter from Bendix regarding the supply and testing of a two-leading shoe brake system. | 5th May 1938 | Box 120 \ 2 scan0311 | |
| Letter to Bendix Ltd. regarding their brake system, discussing drawings and potential modifications. | 5th May 1938 | Box 120 \ 2 scan0312 | |
| Request to Messrs. New Hudson Ltd. for details of pull off springs from their drawing GA/G.745, for use on a Bentley. | 9th May 1938 | Box 120 \ 2 scan0313 | |
| Letter from Bendix Limited concerning the preparation and testing of 'Two Leading Shoe' brakes. | 9th May 1938 | Box 120 \ 2 scan0314 | |
| Page two of a letter from Bendix Limited concerning a braking installation, pedal travel, and actuation methods. | 10th May 1938 | Box 120 \ 2 scan0315 | |
| Letter from Automotive Products Company Ltd confirming the dispatch of brake system parts. | 10th May 1938 | Box 120 \ 2 scan0316 | |
| Description of a brakes system, incorporating a servo motor and hydraulic linkage, intended for a patent application. | 18th May 1938 | Box 120 \ 2 scan0317 | |
| Letter to Automotive Products Ltd. requesting additional parts for altering Lockheed brake equipment. | 20th May 1938 | Box 120 \ 2 scan0318 | |
| Order for materials for Lockheed Brakes, which have been fitted to B.56.BN. | 21th May 1938 | Box 120 \ 2 scan0319 | |
| Letter from the Experimental Dept. to Automotive Products Co. Ltd. requesting a copy of a Lockheed Brake Patent specification. | 23th May 1938 | Box 120 \ 2 scan0320 | |
| Letter from Automotive Products Company Ltd. enclosing a printed copy of a patent specification. | 24th May 1938 | Box 120 \ 2 scan0321 | |
| Letter to Automotive Products Co. Ltd. expressing interest in hydraulic brakes. | 25th May 1938 | Box 120 \ 2 scan0322 | |
| Request to issue an official order for parts to be supplied free of charge from Automotive Products Ltd for record purposes. | 26th May 1938 | Box 120 \ 2 scan0323 | |
| Letter to Bendix Ltd. regarding the experimental fitting of 2.L.S. brakes onto a Bentley B.56.BN. | 4th Jun 1938 | Box 120 \ 2 scan0324 | |
| Letter to New Hudson Ltd. requesting an expedited partial delivery of an order for 50 brake shoes. | 10th Jun 1938 | Box 120 \ 2 scan0325 | |
| Proposal and blueprint for a replacement brake system for the Next Series B.III, B.50, and Wraith models. | 10th Jun 1938 | Box 120 \ 2 scan0326 | |
| Technical specification for a vehicle's braking system, detailing the front, rear, and servo mechanisms. | 10th Jun 1938 | Box 120 \ 2 scan0327 | |
| Features and test results for various brake system schemes, including wrapping brakes. | 10th Jun 1938 | Box 120 \ 2 scan0328 | |
| Comparison of wrapping factors and merit for various brake systems, with a note on interchangeability. | 10th Jun 1938 | Box 120 \ 2 scan0329 | |
| Calculations and notes for a non-servo brake scheme, including different ratios and adjustments. | 10th Jun 1938 | Box 120 \ 2 scan0330 | |
| Brake pedal ratio calculations and braking system component testing. | 10th Jun 1938 | Box 120 \ 2 scan0331 | |
| Diagram and calculations for foot brake pedal ratios for front and rear brakes. | 10th Jun 1938 | Box 120 \ 2 scan0332 | |
| Brake system calculations, testing, and adjustments. | 10th Jun 1938 | Box 120 \ 2 scan0333 | |
| Specification sheet with a diagram and calculations for front and rear brake systems. | 10th Jun 1938 | Box 120 \ 2 scan0334 | |
| Brake system leverage calculations for foot and hand brakes, using 40° cams and non-wrapping shoes. | 10th Jun 1938 | Box 120 \ 2 scan0335 | |
| Parts list and production update for Bentley lll and 50 front brakes and shock absorbers. | 10th Jun 1938 | Box 120 \ 2 scan0336 | |
| Parts list for an Idler Lever Bracket and an instruction to produce levers for shock dampers. | 10th Jun 1938 | Box 120 \ 2 scan0337 | |
| Letter from New-Hudson Ltd regarding an order for 50 brake shoes. | 13th Jun 1938 | Box 120 \ 2 scan0338 | |
| Letter from Bendix regarding the fitting of brakes to an experimental Bentley axle. | 16th Jun 1938 | Box 120 \ 2 scan0339 | |
| Letter from Bendix Limited requesting information on the availability and cost of parts for an experimental brake set. | 16th Jun 1938 | Box 120 \ 2 scan0340 | |
| Letter to New Hudson Ltd. enquiring about their hydraulic brake cylinder design and requesting a drawing. | 16th Jun 1938 | Box 120 \ 2 scan0341 | |
| Merits and drawbacks of a proposed new braking system scheme. | 16th Jun 1938 | Box 120 \ 2 scan0342 | |
| Letter to Bendix Ltd. regarding the enclosure of drawings, material preferences, and drawing specifications. | 21th Jun 1938 | Box 120 \ 2 scan0343 | |
| Letter from New-Hudson Ltd. regarding details and future plans for their hydraulic brake system. | 22th Jun 1938 | Box 120 \ 2 scan0344 | |
| Two typical installations and the functionality of the Lockheed-Gates Booster for fluid brake equipment. | 22th Jun 1938 | Box 120 \ 2 scan0345 | |
| Description of Lockheed-Gates Booster types and a performance comparison chart against conventional vacuum servos. | 22th Jun 1938 | Box 120 \ 2 scan0346 | |
| Technical drawing of a Lockheed-Gates Booster—Transmission Type. | 22th Jun 1938 | Box 120 \ 2 scan0347 | |
| Detailed schematic of a Lockheed-Gates separate type brake booster. | 22th Jun 1938 | Box 120 \ 2 scan0348 | |
| Inventor demonstrating a new vacuum-operated servo for motor car brakes. | 3rd Dec 1926 | Box 120 \ 3 scan0001 | |
| Stating a lack of interest in testing a vacuum-operated servo for motor car brakes. | 4th Dec 1926 | Box 120 \ 3 scan0002 | |
| Business card for Otto J. Badertscher of the Badertscher Vacuum Brake Co. Ltd. with handwritten notes. | 19th May 1927 | Box 120 \ 3 scan0003 | |
| Policy on cars fitted with non-standard Front Wheel Brakes (F.W.B.). | 19th May 1927 | Box 120 \ 3 scan0004 | |
| Letter discussing Bendix brake performance and suggesting the use of harder carbon steel for brake drums. | 13th Oct 1927 | Box 120 \ 3 scan0005 | |
| Letter declining to adopt the 'Sanspareil Hand Brake Lever' after testing, deeming its complexity unjustifiable. | 29th Jun 1928 | Box 120 \ 3 scan0006 | |
| Letter from B. Smith & Son requesting a report on the working of their Sanspareil Patent Hand Brake Lever. | 28th Jun 1928 | Box 120 \ 3 scan0007 | |
| Despatch of a loaned hand brake lever to Messrs. Smith & Son. | 3rd Jul 1928 | Box 120 \ 3 scan0008 | |
| Letter from B. Smith & Son of Bingley regarding the testing of their Sanspareil Hand Brake Lever. | 5th Jul 1928 | Box 120 \ 3 scan0009 | |
| Issues and concerns with non-standard front wheel brakes. | 21th Sep 1928 | Box 120 \ 3 scan0010 | |
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