From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Summary of major differences in brake mechanisms for the Bentley 3.5 Litre Production Chassis.
| Identifier | ExFiles\Box 82\4\ scan0060 | |
| Date | 14th December 1934 | |
| To Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} Rm{William Robotham - Chief Engineer} +4553 BY/TWD{T. W. D???Aeith}1/E.14.12.34. The following is a summary of the major differences between the Bentley 3.5 Litre Production Chassis and N.Sch's. 3786/7. 3974/8/9/80. 4005/6. (1). N.Sch.3786. Layout of Front Brake Mechanism, .525 Cams, 14.125 Dia. Drums. 4º Pivot Lean. Toggle Cam Rad. altered from .365 to .525 Actuating Lever Centres. " " 3.500 " 4.625 Dia. of Brake Drum. " " 12.000 " 14.125 Pivot Lean. " " 1º " 4º Thickness of Brake Lining. " " .312 " .375 Brake Adjustment Range. " " 31º " 35º Pull Rod Geometry modified. (2). N.Sch.3787. Layout of Rear Brake Mechanism, .4675 Cams. 14.125 Dia. Drums. .375 Liners. Toggle Cam Rad. (Foot Brake only) altered from .325 to .4675 Actuating Lever Centres. (Foot Brake Only) " " 2.750 " 3.750 Dia. of Brake Drum. " " 12.000 " 14.125 Thickness of Brake Linings. (Hand & Foot). " " .312 " .375 Brake Adjustment Range. " " 31º " 35º (3). N.Sch.3974. Aluminium Brake Shoes. Rear Brakes. 14.125 Drums. Toggle Cam Rad. (Foot Brake only) altered from .325 to .4675 Dia. of Brake Drum. " " 12.000 " 14.125 Thickness of Brake Linings. (Hand & Foot). " " .312 " .375 Width of Hand Brake Shoe. " " 1.000 " .950 Water Baffle Type of Mud Excluder. (4). N.Sch.3978. Toggle Movements. Rear Brakes. Used with Brakes to N.Sch. 3974. (See - Item 3.) - 1 - | ||