Guest Ray RI Posted July 2, 2015 Share Posted July 2, 2015 I recently purchased an 86 Caprice wagon and have an issue with the brakes. I'll be pulling the rear drums and checking all lines to see if there are any leaks causing the issue is in the next day or so but in the mean time I have been trying to locate a replacement master cylander just in case. The car has the hydraboost power brakes. Does anyone know where I might find a replacement and is it necessary to replace the master and booster as a whole unit??? This setup is all new to me as I am used to the setups on older Lincolns that ran off the power steering pump. Any help/info greatly appreciated. Link to comment Share on other sites More sharing options...
Alfre Posted July 3, 2015 Share Posted July 3, 2015 the master cylinder can be replaced by it self.Check www rock auto.com Link to comment Share on other sites More sharing options...
NTX5467 Posted July 25, 2015 Share Posted July 25, 2015 "HydraBoost", boosted by the power steering pump, usually with diesel V-8s, has a bunch of power steering lines between the power steering pump, the brake booster area, and the power steering pump. "PowerMaster" is a whole different breed of part! An electric pump pumps brake fluid into a "bulb" reservoir on the bottomside of the booster, from the master cylinder reservoir. With the engine off, the reservoir should be "full". With the ignition powered-up, the fluid level in the reservoir will drop to about 1/2. NOT sure why they needed different brake boosters for the wagons than for the cars! Not sure why you couldn't put a regular vacuum booster on a gasoline-engine wagon, but proceed a your own risk in that area. NTX5467 Link to comment Share on other sites More sharing options...
Larry Schramm Posted July 31, 2015 Share Posted July 31, 2015 I believe that some of the Astro / Safari vans also had Hydroboost. Link to comment Share on other sites More sharing options...
Rusty_OToole Posted August 2, 2015 Share Posted August 2, 2015 You can get a master cylinder for an 86 Chev at any auto parts store. They are separate from the booster. The booster does not need to be replaced unless it fails to boost. Link to comment Share on other sites More sharing options...
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