| Description | Date | Identifier | |
| Inquiry to Automotive Products Co. Ltd. regarding the Wagner 'No-Roll' braking system. | 12th Mar 1940 | Box 121 \ 1 scan0225 | |
| Requesting design changes to anti-rattle plates for front and rear brakes. | 12th Mar 1940 | Box 121 \ 1 scan0226 | |
| Letter from Automotive Products Company Ltd. regarding the layout and weight of a proposed hydraulic braking system. | 13th Mar 1940 | Box 121 \ 1 scan0227 | |
| Continuation page of a letter from F.G. Parnell of Automotive Products Company Limited, proposing a meeting in Derby. | 14th Mar 1940 | Box 121 \ 1 scan0228 | |
| Consideration of a Lockheed all-hydraulic brake system. | 14th Mar 1940 | Box 121 \ 1 scan0229 | |
| Letter from Automotive Products Co. Ltd. regarding the proposed layout and estimated weight of twin master cylinders and brake equipment for an experimental car. | 13th Mar 1940 | Box 121 \ 1 scan0230 | |
| Letter from Automotive Products Company Ltd regarding the 'Wagner No-Roll' or 'Hill-Holder' device. | 14th Mar 1940 | Box 121 \ 1 scan0231 | |
| Unsatisfactory rear brake life on 8-cylinder cars and proposing three alternative solutions. | 14th Mar 1940 | Box 121 \ 1 scan0232 | |
| Modified designs be made from a rationalised range of pieces. | 14th Mar 1940 | Box 121 \ 1 scan0233 | |
| Comparing the brake lining wear and performance of three different car models with hydraulic front and Girling rear systems. | 23th Jan 1940 | Box 121 \ 1 scan0234 | |
| Brake performance, wear, and adjustments for car 11.B.V. with Hydraulic Front and Girling Rear brakes. | 23th Jan 1940 | Box 121 \ 1 scan0235 | |
| Brake wear checked at a speedometer reading of 13628 miles. | 23th Jan 1940 | Box 121 \ 1 scan0236 | |
| Comparative test of brake wear on car 33.G.VII, noting a disproportionate wear ratio. | 23th Jan 1940 | Box 121 \ 1 scan0237 | |
| Handbrake linkages and exhaust systems for left-hand drive Senior Range models. | 8th Mar 1940 | Box 121 \ 1 scan0238 | |
| Discovered foul and proposed modification to the foot brake linkage for L.H. Senior Range cars. | 12th Mar 1940 | Box 121 \ 1 scan0239 | |
| Foul discovered in the foot brake linkage for the L.H. Senior range and a proposed modification. | 12th Mar 1940 | Box 121 \ 1 scan0240 | |
| Letter to Automotive Products Co. Ltd. regarding the completion of a scheme with shoes and a double master cylinder. | 14th Mar 1940 | Box 121 \ 1 scan0241 | |
| Alteration to the Brake Pedal Lever drawing, adding a view for clarification. | 8th Apr 1940 | Box 121 \ 1 scan0242 | |
| Parts, modifications, and instructions for the Ripplet Chassis. | 9th Apr 1940 | Box 121 \ 1 scan0243 | |
| Blueprints and a List of Operations (LOP) for the Rear Brakes Inter Shaft. | 9th Apr 1940 | Box 121 \ 1 scan0244 | |
| Cover letter for two blueprints of the Rear Brakes Intermediate Shaft for fitment to Ripplet. | 9th Apr 1940 | Box 121 \ 1 scan0245 | |
| Letter confirming a meeting with British Bolting and Asbestos Ltd. to discuss brakes and a hill holder. | 12th Apr 1940 | Box 121 \ 1 scan0246 | |
| Letter to Automotive Products Co. Ltd. to arrange a meeting to discuss their brake designs on a chassis. | 17th Apr 1940 | Box 121 \ 1 scan0247 | |
| Letter to Automotive Products Co. Ltd. arranging a meeting to discuss brake designs. | 17th Apr 1940 | Box 121 \ 1 scan0248 | |
| Letter to Automotive Products Co. Ltd. requesting advice on brake maintenance procedures for a manual. | 18th Apr 1940 | Box 121 \ 1 scan0249 | |
| Request for the manufacture of three modified brake levers for a hydraulic system. | 18th Apr 1940 | Box 121 \ 1 scan0250 | |
| Letter from Automotive Products Company Ltd arranging a meeting to discuss brake layouts for a new model. | 19th Apr 1940 | Box 121 \ 1 scan0251 | |
| Letter from Automotive Products Company Ltd discussing service instructions for Lockheed hydraulic brakes. | 19th Apr 1940 | Box 121 \ 1 scan0252 | |
| Letter from Automotive Products Company Limited enclosing a Lockheed Service Manual and suggesting a follow-up meeting. | 19th Apr 1940 | Box 121 \ 1 scan0253 | |
| Forces and deflection issues in the foot brake linkage and servo system. | 19th Apr 1940 | Box 121 \ 1 scan0254 | |
| Letter to Press Caps, Ltd. regarding an order for three dozen 26.5 m/m caps for experimental use. | 23th Apr 1940 | Box 121 \ 1 scan0255 | |
| Letter to Press Caps, Ltd. ordering three dozen 26.5 m/m caps for experimental purposes. | 23th Apr 1940 | Box 121 \ 1 scan0256 | |
| Recording a discussion about the design of brake carrier plates for the Rippletto and Senior Range models. | 24th Apr 1940 | Box 121 \ 1 scan0257 | |
| Notes on a visit from Mr. Parnell of Lockheed Brakes to discuss hydraulic brake installation for the Ripplette. | 24th Apr 1940 | Box 121 \ 1 scan0258 | |
| Meeting notes discussing brake system design, including adjustments, lining thickness, and manufacturing. | 24th Apr 1940 | Box 121 \ 1 scan0259 | |
| The specifications, costs, and servicing of a hydraulic brake system, including the master cylinder and hill holder. | 24th Apr 1940 | Box 121 \ 1 scan0260 | |
| The estimated weight of various brake components and a discussion on master cylinder design. | 4th Apr 1940 | Box 121 \ 1 scan0261 | |
| Recording a discussion on the design and modification of brake carrier plates for different axle types. | 24th Apr 1940 | Box 121 \ 1 scan0262 | |
| Specification for the brakes on a left-hand drive car, detailing parts, clearances, and materials. | 25th Apr 1940 | Box 121 \ 1 scan0263 | |
| Material and finish options for Girling wedge brake units, including plating, bushes, and anodising. | 29th Apr 1940 | Box 121 \ 1 scan0264 | |
| Letter to Press Caps, Ltd. requesting caps with cork liners be sent to Mr. M. H. Rigby. | 29th Apr 1940 | Box 121 \ 1 scan0265 | |
| Letter from Automotive Products Company Ltd regarding brake parts for an experimental chassis and Thompson Tie Rods. | 29th Apr 1940 | Box 121 \ 1 scan0266 | |
| Letter from Pressed Steel Company Limited acknowledging a letter and coachbuilder's drawing. | 3rd May 1940 | Box 121 \ 1 scan0267 | |
| Alterations to the L.O.P. rear brakes intermediate shaft, sheet 1. | 7th May 1940 | Box 121 \ 1 scan0268 | |
| Official order to reline 28 brake shoes. | 9th May 1940 | Box 121 \ 1 scan0269 | |
| Official order for caps and cork liners. | 9th May 1940 | Box 121 \ 1 scan0270 | |
| Confirming the dispatch of two blueprints for Oilite bushes for a rear brake inter shaft. | 13th May 1940 | Box 121 \ 1 scan0271 | |
| Letter from Automotive Products Company Ltd regarding design investigations for Thompson Tie Rods. | 13th May 1940 | Box 121 \ 1 scan0272 | |
| Requesting a discussion and pedal ratio calculations for various all-hydraulic brake systems. | 13th May 1940 | Box 121 \ 1 scan0273 | |
| Letter from Automotive Products Company Ltd. regarding a hill-holder unit, with handwritten instructions to order one for trial. | 14th May 1940 | Box 121 \ 1 scan0274 | |
| Letter to Stainless Spinnings Works regarding a print of a spring plate and requesting an investigation and supply of parts. | 14th May 1940 | Box 121 \ 1 scan0275 | |
| Letter from The Stainless Spinning Works confirming a modified drawing for Spring Plates is practical. | 16th May 1940 | Box 121 \ 1 scan0276 | |
| Internal request to issue an official order for a right-hand Hill-holder from Automotive Products Co. Ltd. | 16th May 1940 | Box 121 \ 1 scan0277 | |
| The fitting of a Lockheed Hill-holder to hydraulic brake systems. | 16th May 1940 | Box 121 \ 1 scan0278 | |
| Design revisions for a handbrake for the Senior Range models. | 20th May 1940 | Box 121 \ 1 scan0279 | |
| Continuation page concerning a handbrake replacement for both R.H. and L.H. drive cars. | 24th May 1940 | Box 121 \ 1 scan0280 | |
| Letter to Automotive Products Ltd. requesting further details for the brake layout on the Rippletto car. | 24th May 1940 | Box 121 \ 1 scan0281 | |
| Comparing two design schemes, PL.167 and PL.229, for a revised Buick type pivot. | 24th May 1940 | Box 121 \ 1 scan0282 | |
| Continued internal memo regarding print distribution and a list of detailed points. | 1st Apr 1939 | Box 121 \ 1 scan0283 | |
| Comparing the costs and weight implications of different brake systems, including Lockheed and Girling. | 27th May 1940 | Box 121 \ 1 scan0284 | |
| Confirming the Rippletto car project can await a tandem master cylinder. | 30th May 1940 | Box 121 \ 1 scan0285 | |
| Letter to Automotive Products Co. Ltd. requesting an arrangement drawing of the tandem master cylinder for a hydraulic brake system. | 30th May 1940 | Box 121 \ 1 scan0286 | |
| Request for recommendations on design work to overcome excessive rear brake wear on 8-cylinder cars. | 6th Jun 1940 | Box 121 \ 1 scan0287 | |
| Letter to Automotive Products Co. Ltd. regarding the design and application of a tandem master cylinder. | 6th Jun 1940 | Box 121 \ 1 scan0288 | |
| Typed memorandum page discussing a final scheme and a bore tandem unit. | 11th Jun 1940 | Box 121 \ 1 scan0289 | |
| Notes from a visit by Mr. F.G. Parnell concerning Lockheed brakes, detailing points discussed about clearances, handbrake travel, and master cylinder size. | 11th Jun 1940 | Box 121 \ 1 scan0290 | |
| Master cylinder standardization and a test of 2 leading shoe brakes on a Humber car. | 11th Jun 1940 | Box 121 \ 1 scan0291 | |
| The rationalised braking system for the 12.B.V. model, detailing its faults and modifications. | 11th Jun 1940 | Box 121 \ 1 scan0292 | |
| Analysis of brake performance focusing on F/R ratio, hydraulic pressures, servo operation, and the sequence of brake application. | 11th Jun 1940 | Box 121 \ 1 scan0293 | |
| Technical note on the causes and solutions for 'Servo Judder' in braking systems. | 24th Jun 1940 | Box 121 \ 1 scan0294 | |
| Evaluation and road test of a modified Girling 2-leading shoe braking system. | 24th Jun 1940 | Box 121 \ 1 scan0295 | |
| Comparison of two suggested braking systems from Lockheeds, detailing specifications and pricing against a Girling system. | 24th Jun 1940 | Box 121 \ 1 scan0296 | |
| Technical report discussing issues and remedies for brake squeak and petrol pump problems. | 24th Jun 1940 | Box 121 \ 1 scan0297 | |
| Issues with Neoprene diaphragms and development notes on A.C. mechanical pumps. | 24th Jun 1940 | Box 121 \ 1 scan0298 | |
| Chassis lubrication experiments and weather protection modifications for brakes. | 24th Jun 1940 | Box 121 \ 1 scan0299 | |
| Modifications to plating and experiments in waterproofing the servo unit. | 24th Jun 1940 | Box 121 \ 1 scan0300 | |
| Brake water ingress protection and a summary of development items. | 1st Jul 1940 | Box 121 \ 1 scan0301 | |
| Technical memorandum comparing the self-locking coefficients of Rippletto, Girling, and Lockheed brake systems. | 1st Jul 1940 | Box 121 \ 1 scan0302 | |
| Order request for a dozen modified servo friction linings to be placed with Messrs Ferodo Ltd. | 12th Jul 1940 | Box 121 \ 1 scan0303 | |
| Request to Ferodo Ltd. for the despatch of modified servo friction linings. | 12th Jul 1940 | Box 121 \ 1 scan0304 | |
| Letter to Ferodo Ltd. explaining that pulley tests have been delayed and likely dropped due to the prioritisation of aero work. | 20th Aug 1940 | Box 121 \ 1 scan0305 | |
| Letter to Vauxhall Motors inquiring about the relationship between brake liner wear and temperature. | 21th Aug 1941 | Box 121 \ 1 scan0306 | |
| Instruction for Mr. Leslie to order Ferodo discs. | 27th Aug 1940 | Box 121 \ 1 scan0307 | |
| Letter from Automotive Products Company Ltd. agreeing to modify the Myth brake system as discussed with Rolls Royce. | 16th Sep 1940 | Box 121 \ 1 scan0308 | |
| Letter to F.G. Parnell of Lockheed Hydraulic Brakes Ltd. requesting the return of a visitor's pass. | 13th Sep 1940 | Box 121 \ 1 scan0309 | |
| Letter to Automotive Products Co. Ltd. regarding a dimensional issue with brake wheel cylinders for Myth and Rippletto cars. | 13th Sep 1940 | Box 121 \ 1 scan0310 | |
| Requesting clarification on pedal pressures for the Myth brake lay-out on Lockheed hydraulic brakes. | 21th Sep 1940 | Box 121 \ 1 scan0311 | |
| Cover sheet for a file concerning Lockheed Hydraulic Brakes and a visit from Automotive Products Limited. | 13th Sep 1940 | Box 121 \ 1 scan0312 | |
| Letter from Ferodo Ltd acknowledging a query and promising a full response. | 23th Sep 1940 | Box 121 \ 1 scan0313 | |
| Letter from The Stainless Spinning Works regarding the delivery schedule for Spring Plates GB.5114. | 12th Aug 1940 | Box 121 \ 1 scan0314 | |
| Confirming a request for a complete chart of brake ratios and lining details for various cars. | 24th Sep 1940 | Box 121 \ 1 scan0315 | |
| Meeting with Automotive Products Ltd. regarding Lockheed hydraulic brakes for the Rippletto and Myth models. | 13th Sep 1940 | Box 121 \ 1 scan0316 | |
| Technical discussion on brake system design and calculations for the Myth and Rippletto models. | 13th Sep 1940 | Box 121 \ 1 scan0317 | |
| Letter from Ferodo Ltd discussing the relationship between brake lining wear, temperature, and energy dissipation. | 28th Sep 1940 | Box 121 \ 1 scan0318 | |
| Continuation sheet from Ferodo Ltd. discussing brake lining temperatures, wear, and energy dissipation. | 28th Sep 1940 | Box 121 \ 1 scan0319 | |
| Letter from Ferodo Limited concerning the difficulty of measuring the true temperature of brake linings and drums when one material is non-metallic. | 20th Sep 1940 | Box 121 \ 1 scan0320 | |
| Graph plotting weight loss against Brake Horse Power (B.HP) for Ferodo M.R. brake lining. | 20th Sep 1940 | Box 121 \ 1 scan0321 | |
| Letter to Automotive Products Co. Ltd. about the testing and pricing of zero-lash hydraulic tappets, with the development program paused due to war. | 2nd Oct 1940 | Box 121 \ 1 scan0322 | |
| Letter from Automotive Products Company Ltd regarding the supply and trial of Zero-Lash Hydraulic Tappets. | 30th Sep 1940 | Box 121 \ 1 scan0323 | |
| Data-gathering form from Automotive Products Company, Ltd. for hydraulic tappets. | 30th Sep 1940 | Box 121 \ 1 scan0324 | |
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