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| | | | Joined: Jun 2010 Posts: 2 'Bolter | | 'Bolter Joined: Jun 2010 Posts: 2 | Hello Guys: A newbie question: I have completely overhauled the brakes on 52 1.5 ton. Cylinders honed out good, kits are proper size. When I add fluid (GM 11) and apply pressure, fluid blows past the end cups on the rear (only) cylinders. Thought it might be the fluid, took all apart, cleaned with alcohol, and it still happens. Any ideas ? HELP !!! Jim Garrett | | | | | Joined: Jun 2004 Posts: 8,597 Riding in the Passing Lane | | Riding in the Passing Lane Joined: Jun 2004 Posts: 8,597 | Could the cups on one end be pushed in too far & past the inlet hole? Maybe need adjusting or the push rod is too long. I take it the spring is in the center, then the cups, then the pistons with the recess in the pistons faceing out. The type of fluid would not matter. If you are applying pressure with the drums off you may be blowing the cups out.
They say money can't buy happiness. It can buy old Chevy trucks though. Same thing. 1972 Chevy c10 Cheyenne SuperIn the Gallery Forum | | | | | Joined: Apr 2006 Posts: 48 'Bolter | | 'Bolter Joined: Apr 2006 Posts: 48 | Make sure the cups are not backwards. The skirt should face towards the center of the wheel cylinder. If you hit the brakes without the drums on, you can overextend the amount of travel the cylinder has. When the cups pop back in, they can get nicked and they will leak! I found out the hard way. | | | | | Joined: Jun 2010 Posts: 2 'Bolter | | 'Bolter Joined: Jun 2010 Posts: 2 | Thank You Guys for reply. Cups are installed correctly. I condidered the pushrod length, but they are all the same length and appear to be original. drums are on (I'm tired of taking them off and cleaning them). I thought the pistons or cups might be covering the hole as suggested - what then? larger spring in the middle? I don't want to tinker with the length of push rods only as a last resort. the cups do appear to be blown off, and this last time it was only the bottom cup on the front cylinder on each wheel (each wheel has 2 cylinders). Many Thanks, Jim Garrett | | | | | Joined: Nov 2006 Posts: 2,544 Shop Shark | | Shop Shark Joined: Nov 2006 Posts: 2,544 | I had a similar experience when doing a brake job last year using NORS wheel cylinders. I ended up installing 2 new cups and gave up on the ones that were giving me trouble. I think in my case that the rubber was just old, hard and wasn't going to seal. After doing that I have had no problems and none yet this year, knock on wood. Good Luck Don | | |
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