3/10/2024 0 Comments Master cylinder 1972 dodge dartHowever, you need it because if you don't use it, the pushrod will fall out the back of the master cylinder. But manual brake cars will, because you wind up damaging it when you remove it from the bore. Or someone at the top was making decisions who was too far removed from the final product.Īs I was telling you, the one problem you may run into is getting the little plastic grommet that goes over the end of the pushrod, where it goes into the back of the master cylinder bore. It actually escapes me as to why Chrysler did not equip the cars like this from the beginning - why not put the 7/8" bore master cylinder on the manual brake cars, thereby reducing pedal effort, and put the 1 1/8" bore master cylinder on the power brake cars, thereby reducing rear wheel lockup? Maybe it was a way to get customers to buy power brakes. I don't remember the size difference between 1975 and previous, and the 1976 models. which were only available on the Dart in 1976. The other thing you could do would be to get larger bore calipers. In my experience it was not enough force to lock up the rear wheels. This has the effect of putting more force on the pistons in the brake calipers. Basically you're applying the same mount of force, from your foot, across a smaller area in the master cylinder. Manual brake cars have a 1 1/8" bore master cylinder. The smaller bore master cylinder has a 7/8" bore, and it comes with cars equipped for power brakes. Scott suggested changing the master cylinder on manual-brake cars to reduce pedal effort. On his own 1973 with the same 7 1/4” axle as our 1974, the 13/16” wheel cylinder reduced lockup but did not eliminate it.) Reducing pedal effort (He also suggested that on cars with the heavy 8 3/4” axle, using a 13/16” unit. Daniel suggested the 3/4 inch rear wheel cylinders with our setup - parts: NAPA 37863, Raybestos WC-37863, Bendix 34076, Wagner WC123412, Centric 134.67015, or Chrysler 4423 852. This reduces braking power to the rear wheels, balancing the system more effectively so that they are not so prone to lockup. Two approaches were suggested, one by Daniel Stern, and one by Scott Sigethy.ĭaniel Stern wrote that the key was to replace the rear wheel cylinders with smaller bore versions. However, the rear tires lock up far too quickly when the brakes are applied in emergency situations. This is in many ways the best setup, since it incorporates the more effective discs without the loss of control that comes too often with the power brakes. Our 1974 Plymouth Valiant has manual disc front brakes and, along with every other Valiant, drums in back. Avoiding wheel lock (lockup) when you hit the brakes Allpar, LLC cannot take any responsibility for the outcomes of these processes. Brake upgrades: power brakes, master cylinders, and avoiding lockup
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