| Description | Date | Identifier | |
| Brake wear analysis and steering spring performance. | 8th Jul 1924 | Box 73 \ 3 scan0178 | |
| Modifications to the engine and gearbox, and analysis of servo gear noise. | 18th Jul 1924 | Box 73 \ 3 scan0179 | |
| From CJ to Hs regarding conflicting reports on the road trial testing of standard versus stiffer springs on cars with front wheel brakes. | 21th Jul 1924 | Box 73 \ 3 scan0180 | |
| The hardness of rear brake drums and springs for the side steering tube on the 40/50 HP four-wheel brake chassis. | 22th Jul 1924 | Box 73 \ 3 scan0181 | |
| Changes to the front springing and braking systems of specific car models. | 24th Jul 1924 | Box 73 \ 3 scan0182 | |
| Secret internal memo discussing unsatisfactory road springs on a car with four-wheel brakes. | 1st Aug 1924 | Box 73 \ 3 scan0183 | |
| Testing of front wheel brake parts and springs for 4-wheel brake cars. | 11th Aug 1924 | Box 73 \ 3 scan0184 | |
| Telegram discussing the demonstration of a Landaulet with front brakes and stronger springs. | 11th Aug 1924 | Box 73 \ 3 scan0185 | |
| Communication regarding providing a fitter to assist with fitting 4-wheel brakes on chassis 47 LK. | 11th Aug 1924 | Box 73 \ 3 scan0186 | |
| Alteration of cam diameters and its effect on the servo braking system. | 12th Aug 1924 | Box 73 \ 3 scan0187 | |
| Points for consideration regarding the 40/50 HP Four Wheel Brake Cars. | 2nd Aug 1924 | Box 73 \ 3 scan0188 | |
| Listing required modifications and improvements to car components. | 2nd Aug 1924 | Box 73 \ 3 scan0189 | |
| Stiffness of front springs in relation to car body weight and 4-wheel brakes. | 14th Aug 1924 | Box 73 \ 3 scan0190 | |
| Standardisation sheet for four-wheel brakes on the 40/50 HP chassis. | 18th Aug 1924 | Box 73 \ 3 scan0191 | |
| Letter requesting an official order for work on Chassis 47 LK, as it cannot be charged to a standing job number. | 22th Aug 1924 | Box 73 \ 3 scan0192 | |
| Chassis 47-LK, attaching a copy of another document and requesting an official order. | 23th Aug 1924 | Box 73 \ 3 scan0193 | |
| Conversion of Mr. Royce's car, 6-EX, into a standard model, including the fitting of four-wheel brakes. | 30th Aug 1924 | Box 73 \ 3 scan0194 | |
| Chassis 47-LK, requesting action and the supply of an official order. | 30th Aug 1924 | Box 73 \ 3 scan0195 | |
| Requesting to retain a specific chassis with a smooth engine for demonstration work. | 2nd Sep 1924 | Box 73 \ 3 scan0196 | |
| Clarifying a disagreement regarding the Four Wheel Brake Standardization Sheet. | 5th Sep 1924 | Box 73 \ 3 scan0197 | |
| The phenomenon of front brakes thumping on a four-wheel brake system. | 1st Sep 1924 | Box 73 \ 3 scan0198 | |
| Resolving brake thumping and knocking issues by modifying springs and adding friction. | 10th Sep 1924 | Box 73 \ 3 scan0199 | |
| Proposing to send a mechanic to fix a brake thumping complaint on a 46-PK car. | 12th Sep 1924 | Box 73 \ 3 scan0200 | |
| Four points of action and further explanation regarding a brake thud issue. | 2nd Sep 1924 | Box 73 \ 3 scan0201 | |
| Press demonstrations for new 4-wheel brakes and concerns over spring durability on French roads. | 1st Sep 1924 | Box 73 \ 3 scan0202 | |
| Arrangement of cars with 6 brakes for a press demonstration before the Olympia Exhibition. | 17th Sep 1924 | Box 73 \ 3 scan0203 | |
| Demonstration of a new six-brake system for the Press ahead of the Motor Show. | 19th Sep 1924 | Box 73 \ 3 scan0204 | |
| Ongoing issue of noisy servo gears and the steps taken to investigate it. | 19th Sep 1924 | Box 73 \ 3 scan0205 | |
| Report page concluding that experiments have yielded modifications to reduce noise but not eliminate it entirely. | 19th Sep 1924 | Box 73 \ 3 scan0206 | |
| Suitability of two cars with 4-wheel brakes for trials. | 19th Sep 1924 | Box 73 \ 3 scan0207 | |
| Organising a press demonstration for a new six-brake system before the Motor Show. | 19th Sep 1924 | Box 73 \ 3 scan0208 | |
| Fitting front wheel brakes to 40/50 cars for a press demonstration and issues with servo gear noise. | 20th Sep 1924 | Box 73 \ 3 scan0209 | |
| Poor performance of a demonstration car, chassis 59-PK, and proposed rectifications. | 24th Sep 1924 | Box 73 \ 3 scan0210 | |
| The heavy steering of a 40/50 HP car fitted with 4-wheel brakes. | 24th Sep 1924 | Box 73 \ 3 scan0211 | |
| Servo gear noise in 40/50 HP chassis with 4-wheel brakes, and testing different gear ratios. | 24th Sep 1924 | Box 73 \ 3 scan0212 | |
| Servo and worm gear arrangements to reduce noise in a car gearbox. | 24th Sep 1924 | Box 73 \ 3 scan0213 | |
| The test of a car to investigate a 'booming' noise by substituting the axle. | 25th Sep 1924 | Box 73 \ 3 scan0214 | |
| Secret memo regarding the status of chassis 59-PK and 48-PK, including work done on 4-wheel brakes and suitability for trials. | 25th Sep 1924 | Box 73 \ 3 scan0215 | |
| Unsatisfactory state of chassis 59-PK and the demonstration suitability of chassis 48-PK. | 26th Sep 1924 | Box 73 \ 3 scan0216 | |
| Internal memorandum about organising a demonstration of the 6-wheel braking system for the press. | 26th Sep 1924 | Box 73 \ 3 scan0217 | |
| Tests of Firths 12 1/2 springs and brakes, noting frequent breakages of induction and extra oil pipes. | 26th Sep 1924 | Box 73 \ 3 scan0218 | |
| Summarizing a 10,000-mile test on vehicle 9-FK. | 26th Sep 1924 | Box 73 \ 3 scan0219 | |
| Exhaust washer failures, steering performance, and engine condition including valve wear and oil consumption. | 1st Sep 1924 | Box 73 \ 3 scan0220 | |
| Various mechanical failures and issues observed during testing. | 1st Sep 1924 | Box 73 \ 3 scan0221 | |
| Six matters requiring modification to a vehicle. | 26th Sep 1924 | Box 73 \ 3 scan0222 | |
| Urgent completion of a Cabriolet for a 4-wheel brake demonstration. | 27th Sep 1924 | Box 73 \ 3 scan0223 | |
| Arrangements for a demonstration of the Six Wheel Brakes. | 29th Sep 1924 | Box 73 \ 3 scan0224 | |
| Outlining the plan for a demonstration of the 6-wheel-brakes system on October 10th. | 30th Sep 1924 | Box 73 \ 3 scan0225 | |
| Secret memo regarding sending car 48-PK for testing new springs and demonstrating 4-wheel brakes. | 29th Sep 1924 | Box 73 \ 3 scan0226 | |
| Telegram concerning the strength of springs fitted to cars for a press demonstration. | 1st Oct 1924 | Box 73 \ 3 scan0227 | |
| 'Hs' to 'EP' suggesting a front axle change on the 35-PK car for a 4-wheel brake demonstration. | 1st Oct 1924 | Box 73 \ 3 scan0228 | |
| Providing strict instructions on maintaining secrecy about the new braking system during a press demonstration. | 1st Oct 1924 | Box 73 \ 3 scan0229 | |
| Secret memorandum discussing potential weakness and abnormal wear on the front brake equaliser bracket and bushes. | 10th Feb 1924 | Box 73 \ 3 scan0230 | |
| Questioning the claim of constant leverage in a four-wheel brake system. | 10th Jul 1924 | Box 73 \ 3 scan0231 | |
| Difficulties and adjustments made to front wheel brakes. | 8th Oct 1924 | Box 73 \ 3 scan0232 | |
| Testing plan for front wheel brakes on car 48-PK before the Olympia show. | 9th Oct 1924 | Box 73 \ 3 scan0233 | |
| Leverage of cams in four-wheel brake systems, comparing square cams with Hispano and Perrot system types. | 10th Oct 1924 | Box 73 \ 3 scan0234 | |
| Congratulating staff on a successful demonstration of front wheel brakes to press representatives. | 13th Oct 1924 | Box 73 \ 3 scan0235 | |
| Four-wheel brakes, investigating a thumping sound and proposing friction-based solutions. | 13th Oct 1924 | Box 73 \ 3 scan0236 | |
| Design considerations for a 4-wheel brake system. | 16th Oct 1924 | Box 73 \ 3 scan0237 | |
| Secret memorandum discussing friction in the balancer arm suspending links for four-wheel brakes. | 24th Oct 1924 | Box 73 \ 3 scan0238 | |
| Accompanying a standardisation sheet for four-wheel brakes and updating on spring testing. | 1st Nov 1924 | Box 73 \ 3 scan0239 | |
| Requesting clarification on the interaction between the steering mechanism and brakes following a customer's query. | 1st Nov 1924 | Box 73 \ 3 scan0240 | |
| Technical memorandum explaining the front brake pull rod and equaliser mechanism during steering. | 1st Nov 1924 | Box 73 \ 3 scan0241 | |
| Technical note on the lubrication requirements and design of the front wheel brake system. | 1st Nov 1924 | Box 73 \ 3 scan0242 | |
| Benefits of a servo-assisted braking system and its impact on lubrication intervals. | 1st Nov 1924 | Box 73 \ 3 scan0243 | |
| Common faults in 4-wheel brake systems and the R-R method of brake adjustment. | 1st Nov 1924 | Box 73 \ 3 scan0244 | |
| Page 4 of a typed document discussing the trade-off between accessibility and efficiency. | 8th Nov 1924 | Box 73 \ 3 scan0245 | |
| Front wheel brake details and simplifying lubrication instructions. | 8th Nov 1924 | Box 73 \ 3 scan0246 | |
| Requesting the return of a signed standardisation sheet for four-wheel brakes. | 20th Nov 1924 | Box 73 \ 3 scan0247 | |
| Instructions to coachbuilders regarding floorboard clearance for the 4-wheel brake servo stop. | 24th Nov 1924 | Box 73 \ 3 scan0248 | |
| Standardisation proposal for a new four-wheel brake system with a 60/40 rear/front braking ratio. | 15th Jul 1924 | Box 73 \ 3 scan0249 | |
| Improvements to reduce heat under the floorboards. | 28th Nov 1924 | Box 73 \ 3 scan0250 | |
| Secret memo on modifications to stub axle pivots for Goshawk and 40/50 models with front wheel brakes. | 10th Dec 1924 | Box 73 \ 3 scan0251 | |
| The summary of tests carried out in France on front wheel brakes. | 22th Dec 1924 | Box 73 \ 3 scan0252 | |
| Failures of spare wheel carriers, exhaust valves, and oil pipes. | 22th Dec 1924 | Box 73 \ 3 scan0253 | |
| Issues with crankcase expansion, petrol system contamination, and engine bearing failure due to oil loss. | 22th Dec 1924 | Box 73 \ 3 scan0254 | |
| Summary table detailing tests conducted on EAC.11 cars in France during 1924. | 11th Dec 1924 | Box 73 \ 3 scan0255 | |
| Test report detailing troubles and their remedies for the original high-speed servo on the 46-PK car. | 11th Dec 1924 | Box 73 \ 3 scan0256 | |
| Test report sheet detailing troubles, mileage, and remedies for an original plate clutch servo on a 9-PK car. | 11th Dec 1924 | Box 73 \ 3 scan0258 | |
| Log of troubles, mileage, and remedies for a 98-NK car under test. | 11th Dec 1924 | Box 73 \ 3 scan0259 | |
| Log of component failures, mileage, and remedies recorded during a vehicle test. | 11th Dec 1924 | Box 73 \ 3 scan0260 | |
| Log of troubles, mileage, and remedies from Test No. V for a 35-PK car with an adopted semi-servo scheme. | 11th Dec 1924 | Box 73 \ 3 scan0261 | |
| Troubles encountered during a test of a 35-PK car fitted with new type front springs. | 11th Dec 1924 | Box 73 \ 3 scan0262 | |
| Final test report for the adopted brake scheme on the 9-PK car, detailing troubles and remedies over 11,077 miles. | 11th Dec 1924 | Box 73 \ 3 scan0263 | |
| Test report sheet detailing troubles encountered with Woodheads 20% stiffer front springs on 9-PK & 98-NK cars. | 11th Dec 1924 | Box 73 \ 3 scan0264 | |
| Test report detailing failures of 12.5% stiffer front springs on car 98-NK during a bump test. | 11th Dec 1924 | Box 73 \ 3 scan0265 | |
| Test report log detailing troubles, mileage, and remedies for a 98-NK car with stiffer front springs. | 11th Dec 1924 | Box 73 \ 3 scan0266 | |
| Test report on Dunlop Balloon Tyres fitted to car 98-NK, detailing issues including a broken windscreen and steering wobbles. | 11th Dec 1924 | Box 73 \ 3 scan0267 | |
| Test report on re-designed 12½% stiffer front springs for a 9-PK car, listing faults and remedies over 10,458 miles. | 31th Dec 1924 | Box 73 \ 3 scan0268 | |
| Letter to R-R America Inc. regarding reports on 4-Wheel brakes and their successful fitment to 100/200 cars. | 31th Dec 1924 | Box 73 \ 3 scan0269 | |
| Use of 'Magnolia' high lead whitemetal for the bearing inside the front wheel brake drum. | 2nd Feb 1925 | Box 73 \ 3 scan0270 | |
| Conditions under which front wheel brakes might lock up or cause skidding. | 5th Feb 1925 | Box 73 \ 3 scan0271 | |
| Page 2 of a memo discussing a pressman's view on a front wheel brake incident. | 5th Feb 1925 | Box 73 \ 3 scan0272 | |
| Customer feedback on front brake overheating on mountainous roads and questioning the design's cooling capacity. | 5th Feb 1925 | Box 73 \ 3 scan0273 | |
| Clarifying the function and risks of the front wheel braking system and comparing it to other cars. | 1st Feb 1925 | Box 73 \ 3 scan0274 | |
| Front and rear brake performance, locking issues, and endurance test results. | 25th Sep 1924 | Box 73 \ 3 scan0275 | |
| Front brake drums, explaining the decision to not use ribs for flexibility. | 1st Feb 1925 | Box 73 \ 3 scan0276 | |
| Cover letter requesting copies of Standardisation Sheets for front wheel brakes. | 17th Feb 1925 | Box 73 \ 3 scan0277 | |
| Letter from Rolls Royce of America requesting standardisation sheets and sepia prints for front wheel brakes. | 4th Feb 1925 | Box 73 \ 3 scan0278 | |
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