Wednesday, May 21, 2008

Brake woes...

The hardest part of the conversion for me has been the brakes. My bus had been sitting outside for a while and the brakes were locked on. A new brake job had to be done and I had to do it. New calipers, new pads and springs, new rotors, new pads, new bake lines, new master cylinder.... and the reason I went with a 73 bus instead of the earlier versions is that 73 was one of the first years, if not the first, which had vacuum assist brakes.

No combustion engine means no vacuum,so I bought a vacuum pump from and attached that to the front underside of the bus. Unfortunately I have had no luck in getting it to work properly. When I turn the bus on with the key the pump gurgles loudly for 6-7 seconds until it creates a vacuum in the system and an additional chamber made out of 4 inch PVC pipe. But, the instant I touch the brakes all the vacuum is released on the other side of the brake booster through the air port. I asked a question about this on and I am thinking I have a bad booster valve.

Not much money left at this time for my bus, so replacing the booster will have to wait a while. The brakes work very well as they are anyway, they just take a bit of muscle to get them to really lock up. My right leg may end up twice as big as my left, especially with no clutch action.


Randy C. said...

Yes, you have a bad brake booster. The diaphram is ruptured

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