| Description | Date | Identifier | |
| Blueprint showing a modification to brake shoes to cure squeaks. | 15th Dec 1926 | Box 26 \ 4 Scan318 | |
| Blank page with a red stamp in the bottom right corner. | 15th Dec 1926 | Box 26 \ 4 Scan319 | |
| Two sample sets of brake linings from Messrs. Morgan Crossley & Co. Ltd. for testing. | 1st Jan 1927 | Box 26 \ 4 Scan320 | |
| Letter from Ferodo Limited requesting an opinion on sample clutch plates submitted for testing. | 11th Jan 1927 | Box 26 \ 4 Scan321 | |
| Letter to Ferodo Ltd. requesting material suggestions and a quote for Hand Starter Clutch discs. | 31th Jan 1927 | Box 26 \ 4 Scan322 | |
| Properties and potential cost savings of two types of brake linings from Morgan Crossley & Company. | 15th Feb 1927 | Box 26 \ 4 Scan323 | |
| Cover letter for test reports on a lining from Morgan Crossley Co. conducted by the National Physical Laboratory. | 13th Apr 1927 | Box 26 \ 4 Scan324 | |
| Lining tests conducted by the National Physical Laboratory for Morgan Crossley Co. | 13th Apr 1927 | Box 26 \ 4 Scan325 | |
| Report from the National Physical Laboratory on a wear test of bonded asbestos brake lining material. | 20th Oct 1926 | Box 26 \ 4 Scan326 | |
| Engineering department test report detailing the particulars and results of a wear test on material strips. | 20th Oct 1926 | Box 26 \ 4 Scan327 | |
| Test report on a material's resistance to wear and coefficient of friction. | 20th Oct 1926 | Box 26 \ 4 Scan328 | |
| Record of a material wear and friction test, with tabulated results and conclusions. | 28th Mar 1927 | Box 26 \ 4 Scan329 | |
| The procurement and testing of Tenoid brake linings for 40/50 HP and 20 HP cars. | 21th Apr 1927 | Box 26 \ 4 Scan330 | |
| Clarifying which samples of Tenoid brake linings are required, either Type 'F' or Type 'T'. | 22th Apr 1927 | Box 26 \ 4 Scan331 | |
| Request for two types of Tenoid brake lining material. | 23th Apr 1927 | Box 26 \ 4 Scan332 | |
| New design for a silent brake stop on the 40/50 HP model. | 28th Apr 1927 | Box 26 \ 4 Scan333 | |
| Advising of a two to three week delay for specially made Tenoid Brake Linings from Morgan Crossley. | 2nd May 1927 | Box 26 \ 4 Scan334 | |
| The unsuitability of 'T' type Tenoid Brake Linings due to squeaking, leading to an order cancellation. | 11th May 1927 | Box 26 \ 4 Scan335 | |
| Instruction note regarding the receipt of Ferodo brake linings for 20 HP and 40/50 models. | 31th May 1927 | Box 26 \ 4 Scan336 | |
| Requirement for front brake linings only for a 40/50 HP car. | 3rd Jun 1927 | Box 26 \ 4 Scan337 | |
| Order for Tenoid Brake Linings for 40/50 HP and 20 HP chassis. | 13th Jun 1927 | Box 26 \ 4 Scan338 | |
| Customer dispute over the refusal to fit 'Tenoid' brake linings to a Pre-war S.G. Chassis. | 19th Aug 1927 | Box 26 \ 4 Scan339 | |
| Testing and performance of 'T' and 'F' type Tenoid brake linings. | 19th Aug 1927 | Box 26 \ 4 Scan340 | |
| The performance and mileage of Tenoid brake linings fitted to various cars. | 20th Aug 1927 | Box 26 \ 4 Scan341 | |
| Questioning the advertising claims of Raybestos Co. regarding their clutch linings. | 8th Sep 1927 | Box 26 \ 4 Scan342 | |
| Query requesting information on Morgan Crossley Brake Linings currently under observation. | 17th Sep 1927 | Box 26 \ 4 Scan343 | |
| Letter from Morgan, Crossley & Co. Ltd. proposing a meeting to discuss test results for TENOID Brake Lining. | 20th Oct 1927 | Box 26 \ 4 Scan344 | |
| Requesting a reply regarding Morgan Crossley Brake Linings currently under observation. | 21th Oct 1927 | Box 26 \ 4 Scan345 | |
| Quality requirements for an order of brake linings from supplier Morgan Crossley & Co. | 26th Oct 1928 | Box 26 \ 4 Scan346 | |
| Request for drawings of a special type of Tenoid brake lining for a 40/50 HP 10,000-mile test. | 26th Oct 1927 | Box 26 \ 4 Scan347 | |
| The failure of two types of Tenoid brake linings from Morgan Crossley to be squeak-proof and arranging a new test. | 26th Oct 1927 | Box 26 \ 4 Scan348 | |
| 10,000-mile test for TENOID brake linings. | 26th Oct 1927 | Box 26 \ 4 Scan349 | |
| Letter to Messrs. Morgan Crossley & Co. Ltd. rejecting two types of brake lining due to a tendency to squeak. | 26th Oct 1927 | Box 26 \ 4 Scan350 | |
| Letter to Morgan Crossley & Co. Ltd. discussing brake lining pressure and coefficients of friction. | 28th Oct 1927 | Box 26 \ 4 Scan351 | |
| Requesting an urgent order for Tenoid brake linings for a test car, noting previous quality control issues. | 11th Nov 1927 | Box 26 \ 4 Scan352 | |
| Letter from Morgan, Crossley & Co. Ltd. confirming the dispatch of ready-drilled linings for order 71772. | 17th Nov 1927 | Box 26 \ 4 Scan353 | |
| Letter from a supplier regarding brake squeak issues and arranging a meeting to discuss a new material. | 29th Nov 1927 | Box 26 \ 4 Scan354 | |
| Letter from Raybestos-Belaco Ltd. regarding the enclosure of a Reference Book and future data sheets. | 2nd Dec 1927 | Box 26 \ 4 Scan355 | |
| Letter to Messrs. Raybestos-Belaco Ltd. acknowledging receipt of information and promising to share compiled data. | 3rd Dec 1927 | Box 26 \ 4 Scan356 | |
| Letter to British Belting Ltd. regarding the postponement of further tests on brake linings. | 8th Dec 1927 | Box 26 \ 4 Scan357 | |
| Internal request to obtain various brake linings from Raybestos Ltd. | 15th Dec 1927 | Box 26 \ 4 Scan358 | |
| Request to fit Raybestos brake linings to a Sports Phantom and Tenoid linings to a 12-EX. | 5th Jan 1928 | Box 26 \ 4 Scan359 | |
| Supply and fitting of new brake linings for vehicles 8-EX and 12-EX. | 4th May 1928 | Box 26 \ 4 Scan360 | |
| 10,000-mile test of Raybestos brake linings, which were rejected for scoring brake drums. | 4th May 1928 | Box 26 \ 4 Scan361 | |
| The supply and ordering of Ferodo brake shoe linings for 40/50-HP & 20-HP chassis. | 16th Jun 1928 | Box 26 \ 4 Scan362 | |
| Query regarding the advisability of fitting improved quality Ferodo brake shoe linings to 40/50-HP & 20-HP chassis. | 26th Jun 1928 | Box 26 \ 4 Scan363 | |
| Recommendation to order new type Ferodo brake linings for 20 HP and 40/50 HP models. | 16th Jul 1928 | Box 26 \ 4 Scan364 | |
| Confirming receipt of liners from Ferodo Ltd. made of bonded asbestos. | 20th Aug 1928 | Box 26 \ 4 Scan365 | |
| Experimental results from testing various types of brake linings. | 24th Aug 1928 | Box 26 \ 4 Scan366 | |
| Page comparing the cost and characteristics of 'Tenoid' and 'Ferodo' materials. | 1st Aug 1928 | Box 26 \ 4 Scan367 | |
| Standardisation and trial of 'Tenoid' brake linings on Phantom cars. | 1st Aug 1928 | Box 26 \ 4 Scan368 | |
| Experimental testing of various brake linings, concluding with a recommendation to use Tenoid P for production. | 24th Aug 1928 | Box 26 \ 4 Scan369 | |
| Testing and comparison of Tenoid brake lining grades P and P.M from Morgan Crossley & Co. | 24th Sep 1928 | Box 26 \ 4 Scan370 | |
| Differences between Grade P and Grade PM Tenoid Linings and confirming an order. | 28th Sep 1928 | Box 26 \ 4 Scan371 | |
| Standardisation proposal for Tenoid brake linings on the 40/50 HP chassis to reduce squeaking. | 24th Aug 1928 | Box 26 \ 4 Scan372 | |
| 'Mintex Semi Rigid T.F.N.' brake lining samples from the British Belting & Asbestos Company, detailing composition and test results. | 23th Oct 1928 | Box 26 \ 4 Scan373 | |
| Test results graph and data for Mintex T.F.N. wet woven brake lining material. | 14th Sep 1928 | Box 26 \ 4 Scan374 | |
| Request for sample friction discs from manufacturers Raybestos, Tenoid, and Ferodo to specification G.76792. | 31th Jan 1929 | Box 26 \ 4 Scan375 | |
| Recommendation to switch brake lining material from Tenoid to Ferodo due to increased squeaking. | 1st Apr 1929 | Box 26 \ 4 Scan376 | |
| Request to obtain 'SS' brake linings in two different Ferodo asbestos materials for testing. | 4th Apr 1929 | Box 26 \ 4 Scan377 | |
| Order for two complete sets of front and rear brake liners. | 17th Apr 1929 | Box 26 \ 4 Scan378 | |
| Urgent internal memo requesting an order for woven cotton friction discs from 'The Halo people'. | 19th Apr 1929 | Box 26 \ 4 Scan379 | |
| The types of brake lining material, Ferodo and Ferobestos, for S.S. cars. | 30th Apr 1929 | Box 26 \ 4 Scan380 | |
| Preliminary report on the performance of Johns-Manville brake linings on car MX-4. | 10th May 1929 | Box 26 \ 4 Scan381 | |
| Tests and conclusions on different brake linings to resolve braking issues like squeaking and drum scoring. | 10th May 1929 | Box 26 \ 4 Scan382 | |
| Issues with squeaking brakes on 'SS' cars, cancelling Tenoid linings and evaluating Ferodo and Ferobestos materials. | 10th May 1929 | Box 26 \ 4 Scan383 | |
| Order for sets of SS. Brake Linings. | 10th May 1929 | Box 26 \ 4 Scan384 | |
| Agreed brake arrangement for all S.S. cars, with a diagram of lever dimensions. | 10th May 1929 | Box 26 \ 4 Scan385 | |
| Urgent memo regarding supply limitations on 'Ferodo' brake linings for the J.2 Series and ordering 'Ferbestos D' as an alternative. | 13th May 1929 | Box 26 \ 4 Scan386 | |
| Final S.S. Brake Layout and lever lengths for a production chassis, including brake lining material options. | 1st May 1929 | Box 26 \ 4 Scan387 | |
| The cancellation and stock liability of 'J2' Series brake shoe liners from suppliers Ferodo Ld. and Morgan Crossley & Co. | 22th May 1929 | Box 26 \ 4 Scan388 | |
| Recommendations for different brake lining materials, such as Ferobestos and Tenoid, for various car models. | 1st May 1929 | Box 26 \ 4 Scan389 | |
| Instruction to arrange the fitting of Ferobestos brake linings to all further SS cars. | 24th May 1929 | Box 26 \ 4 Scan390 | |
| Recommendations for different brake lining materials such as Ferobestos, Tenoid, and bonded asbestos. | 1st May 1929 | Box 26 \ 4 Scan391 | |
| Instruction specifying 'Ferobestos D' for J-2 series foot brakes, retaining Ferodo for hand brakes, and holding 'Tenoid' material in stock. | 27th May 1929 | Box 26 \ 4 Scan392 | |
| Clarifying the standard asbestos brake lining material for the 20 HP Car, distinguishing between Ferodo and Ferobestos. | 28th May 1929 | Box 26 \ 4 Scan393 | |
| Letter concerning the performance and supply of 'soft' and 'hard' brake linings from Johns-Manville. | 13th Jun 1929 | Box 26 \ 4 Scan394 | |
| Letter discussing the smoothness and testing of J.M. brake linings. | 20th Jun 1929 | Box 26 \ 4 Scan395 | |
| Letter from Bentley Motors confirming the satisfactory performance of 'Halo' brake and clutch linings used in their Le Mans race cars. | 20th Jun 1929 | Box 26 \ 4 Scan396 | |
| Letter from British Belting & Asbestos Ltd regarding their HALO brake linings used on winning Bentley cars at the Le Mans Grand Prix. | 21th Jun 1929 | Box 26 \ 4 Scan397 | |
| Standardisation document for Ferobestos brake lining to reduce squeaks. | 4th Jun 1929 | Box 26 \ 4 Scan398 | |
| Form for the standardisation of a chassis part, detailing costs and testing information. | 21th Jun 1928 | Box 26 \ 4 Scan399 | |
| The ordering of Tenoid material for brake linings. | 18th Jul 1929 | Box 26 \ 4 Scan400 | |
| Sample 40/50 HP Clutch Disc from the Ferodo Company, detailing a new manufacturing process. | 9th Sep 1929 | Box 26 \ 4 Scan401 | |
| Testing a new 'R.A.D. Type' clutch disc from the Ferodo Company due to issues with existing discs for the 40/50 HP clutch. | 4th Sep 1929 | Box 26 \ 4 Scan402 | |
| Letter to Ferodo Ltd. regarding moulding friction material onto clutch plates for testing. | 17th Sep 1929 | Box 26 \ 4 Scan403 | |
| Letter from Ferodo Limited discussing the use of an elastic layer between clutch linings to prevent juddering. | 9th Nov 1929 | Box 26 \ 4 Scan404 | |
| Letter to Ferodo Ltd. requesting modifications to a Phantom II clutch plate by adding a layer of cork. | 3rd Dec 1929 | Box 26 \ 4 Scan405 | |
| Letter from Ferodo Limited regarding a clutch plate with cork backing. | 5th Dec 1929 | Box 26 \ 4 Scan406 | |
| Letter from Ferodo Limited acknowledging receipt of correspondence and a blueprint. | 19th Sep 1929 | Box 26 \ 4 Scan407 | |
| Clutch performance for the 21-EX chassis, detailing judder and disengagement problems. | 30th Sep 1929 | Box 26 \ 4 Scan408 | |
| 'Japan' improvements to the 20 HP clutch, including a Phantom damping plate and washer adjustment. | 1st Oct 1929 | Box 26 \ 4 Scan409 | |
| Letter from Ferodo Limited discussing the design and materials for two new clutch plates. | 2nd Oct 1929 | Box 26 \ 4 Scan410 | |
| Letter from Ferodo Limited apologising for the date of the letter, with sketches at the bottom. | 2nd Oct 1929 | Box 26 \ 4 Scan411 | |
| Modification to the Phantom II clutch, referencing drawing N.Sch.2967. | 15th Oct 1929 | Box 26 \ 4 Scan412 | |
| Letter from Ferodo Limited concerning the delivery and specifications of two types of clutch plates. | 18th Oct 1929 | Box 26 \ 4 Scan413 | |
| Letter from Ferodo Limited regarding a new clutch disc without metallic stitching. | 19th Oct 1929 | Box 26 \ 4 Scan414 | |
| Letter to Ferodo Ltd. suggesting a modification to clutch driven plates to reduce juddering. | 1st Nov 1929 | Box 26 \ 4 Scan415 | |
| Modifications to the Phantom II clutch based on a proposal by Mr. Royce. | 6th Nov 1929 | Box 26 \ 4 Scan416 | |
| Proposed modifications to the 20/25 HP clutch, including the use of Ferodo. | 6th Nov 1929 | Box 26 \ 4 Scan417 | |
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