| Description | Date | Identifier | |
| Torque estimations and recommendations for EAC.10 servo gears. | 13th Dec 1927 | Box 12 \ 5 05-page044 | |
| Arrangement of brake differentials, referencing schedule N.sch.2539 and gearbox mounting. | 2nd Feb 1928 | Box 12 \ 5 05-page045 | |
| Design and modification of the EAC.10 hand brake lever shaft and equaliser. | 2nd Feb 1928 | Box 12 \ 5 05-page046 | |
| Design of a rear brake compensating shaft. | 12th Mar 1928 | Box 12 \ 5 05-page047 | |
| Proposal for centralised chassis lubrication for the rear axle. | 17th Mar 1928 | Box 12 \ 5 05-page048 | |
| Design review memo on drawing N.sch.2551, highlighting issues with a lever offset and tool accessibility. | 2nd Apr 1928 | Box 12 \ 5 05-page049 | |
| Phantom brake testing actions agreed upon at a Derby conference. | 2nd May 1928 | Box 12 \ 5 05-page050 | |
| Required modifications for centralised chassis lubrication points. | 18th May 1928 | Box 12 \ 5 05-page051 | |
| Instructions regarding the fitting of an Enots nipple for lubrication, replacing the Bijur pump. | 23th May 1928 | Box 12 \ 5 05-page052 | |
| Centralised chassis lubrication for the brake differential and hand brake lever. | 23th May 1928 | Box 12 \ 5 05-page053 | |
| Standardisation document for rear brakes similar to the 20 HP model. | 2nd May 1928 | Box 12 \ 5 05-page054 | |
| Form for the standardisation of chassis parts, detailing the first chassis fitment, test date, and tooling costs. | 12th Nov 1928 | Box 12 \ 5 05-page055 | |
| Standardisation of brake linings for the 40/50 HP model to reduce squeaking. | 24th Aug 1928 | Box 12 \ 5 05-page056 | |
| Recommendation to modify the drain pipes on the Phantom's side-by-side rear brakes to prevent them from being choked by mud. | 9th Oct 1928 | Box 12 \ 5 05-page057 | |
| Instruction to use the attached damper sector on the first three SS brakes. | 13th Nov 1928 | Box 12 \ 5 05-page058 | |
| Instructions and diagram for fitting wooden plugs into brake shafts for rear axles. | 16th Nov 1928 | Box 12 \ 5 05-page059 | |
| Recommendation to adopt scheme N.sch.2746 for the drain on the side by side rear brakes. | 26th Nov 1928 | Box 12 \ 5 05-page060 | |
| Poor braking on car 18-EX, questioning if leverage changes were made. | 28th Dec 1928 | Box 12 \ 5 05-page061 | |
| Delay in brake effectiveness and a potential diagnosis for the issue. | 12th Jun 1928 | Box 12 \ 5 05-page062 | |
| Requesting modifications for 'SS' brakes on a 19-EX model. | 13th Dec 1928 | Box 12 \ 5 05-page063 | |
| Instruction to experimentally alter the 'SS' chassis brakes by fitting 30° servo cams and increasing the length of lever G.76811. | 17th Dec 1928 | Box 12 \ 5 05-page064 | |
| Query regarding the correct angle for the Phantom servo operating cams, seeking confirmation between 45° and 55°. | 18th Dec 1928 | Box 12 \ 5 05-page065 | |
| Requesting modifications to car 19-EX, concerning the engine feet, gearbox support, and brakes. | 19th Dec 1928 | Box 12 \ 5 05-page066 | |
| The cam angle used on the Phantom servo and brakes. | 22th Dec 1928 | Box 12 \ 5 05-page067 | |
| Issues with rear brakes filling with water, axle manufacturing variations, and proposed solutions. | 1st Jan 1929 | Box 12 \ 5 05-page068 | |
| The trial of aluminium castings for 'SS' model rear brakes as a cost-saving alternative to duralumin. | 7th Jan 1929 | Box 12 \ 5 05-page069 | |
| High cost of duralumin forged brake shoes and proposing a trial of aluminium castings for 'SS' rear brakes. | 7th Jan 1929 | Box 12 \ 5 05-page070 | |
| Issues with 'SS' brakes filling with water and mud, with proposals for design modifications. | 7th Jan 1929 | Box 12 \ 5 05-page071 | |
| Experimental reduction in the number of oil drain holes in the S.S. & Phantom rear brake drums. | 9th Jan 1929 | Box 12 \ 5 05-page072 | |
| Telegram discussing the disadvantages of increasing cam angle and proposing thirty-degree cams as a compromise. | 25th Jan 1929 | Box 12 \ 5 05-page073 | |
| Inquiry regarding the effectiveness of the rear brake mud shield on the Phantom model. | 19th Jan 1929 | Box 12 \ 5 05-page074 | |
| Investigation into the angle of servo cams and lever length on the 'SS' brake gear. | 27th Jan 1929 | Box 12 \ 5 05-page075 | |
| Performance issues with 'SS' Brakes, including poor proportioning, noise, and water ingress concerns. | 1st Feb 1929 | Box 12 \ 5 05-page076 | |
| Loss of oil pressure after braking, with proposals for testing and sump system modifications. | 7th Feb 1929 | Box 12 \ 5 05-page077 | |
| Comparison of oil suction systems and strainer designs between the SS, Phantom, and India chassis models. | 15th Feb 1929 | Box 12 \ 5 05-page078 | |
| Effect of braking on oil flow and potential solutions regarding filters and diaphragms. | 15th Feb 1929 | Box 12 \ 5 05-page079 | |
| Alterations to the S.S. rear brake camshafts and associated components. | 9th Feb 1929 | Box 12 \ 5 05-page080 | |
| Production of the 'SS' servo and brake mechanism and the material for servo linings. | 13th Mar 1929 | Box 12 \ 5 05-page081 | |
| Request for parts to be made for brake gear experiments as per sketches HS.210/211/212. | 13th Mar 1929 | Box 12 \ 5 05-page082 | |
| Clearance issue with the 'SS' brake cables. | 15th Mar 1929 | Box 12 \ 5 05-page083 | |
| Cover note explaining an instruction regarding SS cars was sent to Mr. Royce in error. | 20th Mar 1929 | Box 12 \ 5 05-page084 | |
| Clearance issue with the L.H. front brake cable and a proposed modification. | 15th Mar 1929 | Box 12 \ 5 05-page085 | |
| Request to modify the front brake equaliser shaft for the 12-EX model. | 3rd Apr 1929 | Box 12 \ 5 05-page086 | |
| Requesting different types of 'SS' brake linings for testing. | 4th Apr 1929 | Box 12 \ 5 05-page087 | |
| Letter to Mr. Hancock in France regarding a complaint of grabbing brakes and potential remedies. | 11th Apr 1929 | Box 12 \ 5 05-page088 | |
| Continued letter regarding the replacement of cotton duck liners with Ferodo liners and cams for braking system adjustments. | 15th Apr 1929 | Box 12 \ 5 05-page089 | |
| Letter discussing excessive front braking on 'SS' models and potential solutions involving servo efficiency and materials. | 15th Apr 1929 | Box 12 \ 5 05-page090 | |
| Brake lining materials, servo efficiency, and modifications to braking and steering components. | 15th Apr 1929 | Box 12 \ 5 05-page091 | |
| Page requesting a report on a side steering tube. | 16th Apr 1929 | Box 12 \ 5 05-page092 | |
| Programme of modifications for 'SS' braking systems, including new linings and other efficiency improvements. | 16th Apr 1929 | Box 12 \ 5 05-page093 | |
| Programme to modify 'SS' braking systems. | 16th Apr 1929 | Box 12 \ 5 05-page094 | |
| Internal instruction to order two complete sets of front and rear brake liners made from Ferodo bonded asbestos. | 17th Apr 1929 | Box 12 \ 5 05-page095 | |
| Confirming instructions to fit car 21-EX with specific brake leverage and servo cams. | 18th Apr 1929 | Box 12 \ 5 05-page096 | |
| Why the cross steering tube fouls the dampers under maximum braking. | 19th Apr 1929 | Box 12 \ 5 05-page097 | |
| Urgent request to order 4 pairs of woven cotton friction discs from 'The Halo people'. | 19th Apr 1929 | Box 12 \ 5 05-page098 | |
| Outlining the history of continuous tests and modifications to the 'SS' braking system. | 19th Apr 1929 | Box 12 \ 5 05-page099 | |
| Investigation into brake sponginess and squeaking, focusing on servo performance and lining efficiency. | 19th Apr 1929 | Box 12 \ 5 05-page100 | |
| Tests conducted on brake linkage efficiency and proposed improvements. | 19th Apr 1929 | Box 12 \ 5 05-page101 | |
| Development work for a braking system, including improvements to the rear brake equalising shaft and servo lining selection. | 19th Apr 1929 | Box 12 \ 5 05-page102 | |
| Design and potential issues of side-by-side rear brakes for the 'Phantom' chassis. | 19th Apr 1929 | Box 12 \ 5 05-page103 | |
| Correcting a typo in a previous communication and inquiring about brake squeak in a modified arrangement. | 22th Apr 1929 | Box 12 \ 5 05-page104 | |
| The preparation and manufacture of various brake system components for testing. | 1st Apr 1929 | Box 12 \ 5 05-page105 | |
| Instructions for testing modifications to a vehicle's braking system, including longer levers and new linings. | 25th Apr 1929 | Box 12 \ 5 05-page106 | |
| Tests for dry servo linings, brake cams, and comparisons of steering systems. | 25th Apr 1929 | Box 12 \ 5 05-page107 | |
| Instructions for testing pivot lean, toe-in, and damper loads on a new axle. | 1st May 1929 | Box 12 \ 5 05-page108 | |
| Recurring complaints of squeaking brakes and an engine oil leak on car 'SS' - 22-EX. | 1st May 1929 | Box 12 \ 5 05-page109 | |
| Remedies for squeaking, oil leaks, and starter motor failures on experimental cars. | 5th May 1929 | Box 12 \ 5 05-page110 | |
| Order for sets of non-impregnated wire brake linings and additional pieces. | 10th May 1929 | Box 12 \ 5 05-page111 | |
| Agreed brake arrangement for S.S. cars, with a diagram of lever dimensions. | 10th May 1929 | Box 12 \ 5 05-page112 | |
| Retention of experimental levers and cams for the S.S. braking system. | 16th May 1929 | Box 12 \ 5 05-page113 | |
| Final S.S. brake layout for a production chassis, including a dimensioned sketch and specifications for lining materials. | 5th May 1929 | Box 12 \ 5 05-page114 | |
| Altering car leverage to prevent squeaking front brakes and improve consistency. | 17th May 1929 | Box 12 \ 5 05-page115 | |
| Cause of squeaking front brakes and proposing a test for new flanged brake drums. | 28th May 1929 | Box 12 \ 5 05-page116 | |
| Improvements to S.S. Brakes and Servo action using a woven cotton disc lining. | 29th May 1929 | Box 12 \ 5 05-page117 | |
| Analysis of brake lining materials and alternative brake cam configurations to reduce wear and squeaks. | 29th May 1929 | Box 12 \ 5 05-page118 | |
| Issues with squeaking brakes, comparing Johns-Manville and Ferobestos linings, and referencing tests on a Phantom. | 29th May 1929 | Box 12 \ 5 05-page119 | |
| Test report on lubricated cotton duck linings for the 'SS' servo. | 29th May 1929 | Box 12 \ 5 05-page120 | |
| Arranging for investigation and a standard Phantom front axle changeover on the 21-EX car in France. | 29th Jun 1929 | Box 12 \ 5 05-page121 | |
| Letter detailing an investigation into a clanking noise produced by servo-operated brakes upon release. | 12th Jul 1929 | Box 12 \ 5 05-page122 | |
| Brake system adjustments, testing of Tee lever offsets, and suggestions for redesign. | 12th Jul 1929 | Box 12 \ 5 05-page123 | |
| Supplementary note discussing issues and improvements for a servo-brake mechanism, particularly regarding noise and action upon release. | 12th Jul 1929 | Box 12 \ 5 05-page124 | |
| Blueprint drawing of a Servo Crank, including two proposals for its operation. | 15th Jul 1929 | Box 12 \ 5 05-page125 | |
| Extract concerning an issue with groaning brakes on the S.S. chassis, a noise also found on experimental cars. | 8th Aug 1929 | Box 12 \ 5 05-page126 | |
| Urgent request for two custom-made brake drum rings to address an epidemic of brake squeaks. | 16th Aug 1929 | Box 12 \ 5 05-page127 | |
| Complaints and potential cures for a clanking noise in the brake mechanism upon pedal release. | 1st Oct 1929 | Box 12 \ 5 05-page128 | |
| Solutions for brake system issues, including fitting a stop to the equaliser shaft and using pads to reduce noise. | 2nd Oct 1929 | Box 12 \ 5 05-page129 | |
| Test report on a buffer stop applied to a servo balance lever to prevent clanking. | 2nd Oct 1929 | Box 12 \ 5 05-page130 | |
| Description of a damper's function within the brake mechanism. | 8th Oct 1929 | Box 12 \ 5 05-page131 | |
| Blueprint for a 20 HP front brake equalizing stop. | 8th Oct 1929 | Box 12 \ 5 05-page132 | |
| Blueprint of the front brake equalizer stop for a 20 HP model. | 5th Oct 1929 | Box 12 \ 5 05-page133 | |
| The clanking of the brake mechanism, referencing an attached print. | 5th Oct 1929 | Box 12 \ 5 05-page134 | |
| Study of a 'servo clank' issue in a braking linkage, comparing standard, experimental, and proposed designs. | 12th Nov 1928 | Box 12 \ 5 05-page135 | |
| Technical memo about issues with the Phantom II braking system, pedal movement, and servo gear clearances. | 24th Oct 1929 | Box 12 \ 5 05-page136 | |
| Outlining settings for buffer springs and servo brake systems on experimental cars. | 24th Oct 1929 | Box 12 \ 5 05-page137 | |
| Brake clearance issues and recommendations for the Phantom II model. | 24th Oct 1929 | Box 12 \ 5 05-page138 | |
| Specifications for buffer springs, servo brake clearance, and pedal/lever movement. | 24th Oct 1929 | Box 12 \ 5 05-page139 | |
| Brake pedal feel, leverage ratios, and clearance issues on the Phantom II. | 30th Oct 1929 | Box 12 \ 5 05-page140 | |
| Issues and proposed adjustments for the Phantom II braking system. | 5th Nov 1929 | Box 12 \ 5 05-page141 | |
| Reduction in pedal travel for the Phantom I and a warning to coachbuilders. | 5th Nov 1929 | Box 12 \ 5 05-page142 | |
| Graph showing rear brake lever movement due to road spring deflection. | 2nd Nov 1929 | Box 12 \ 5 05-page143 | |
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