Air in rear wheel cylinders

[va1968sh]

My 1988 Grand Wagoneer has all new brake system; rotors, calibers, master cylinder, drums, pads, shoes, combination valve, etc. About every 6-8 days, the rear wheel cylinders get full of air and the brake warning light comes on. I have bleed them so much that I have a stock pile of brake fluid in my garage. I cannot see any signs of fluid loss or leaks. I have also tried three "new" master cylinders-that's not the problem. I am sure when I bleed them, all the air is removed-over a pint of fluid between the two rear wheels. I am at a loss to figure out this problem. Has anyone got any suggestions???

Sidney Helms
Ridgeway, Va
karensidney@kimbanet.com


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Sid Helms

[andy d]

[QUOTE]Originally posted by va1968sh:
My 1988 Grand Wagoneer has all new brake system; rotors, calibers, master cylinder, drums, pads, shoes, combination valve, etc. About every 6-8 days, the rear wheel cylinders get full of air and the brake warning light comes on. I have bleed them so much that I have a stock pile of brake fluid in my garage. I cannot see any signs of fluid loss or leaks. I have also tried three "new" master cylinders-that's not the problem. I am sure when I bleed them, all the air is removed-over a pint of fluid between the two rear wheels. I am at a loss to figure out this problem. Has anyone got any suggestions???

Sidney Helms
Ridgeway, Va
karensidney@kimbanet.com


[/QUOTE sounds like system is dragging air.usually thats a bad cylinder.when you replaced mast cyl did you "bench bleed" it prior to installation? are all conections tight?are steel lines good? up here in Mass,the lines rot out b4 other stuff fails. are rear brakes adjusted enuf? goodluck




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'88 gwag

[Brenton]

I'll second that. The only way to pull the air in is with a bad cylincder, or a leak somewhere's in your line. Keep in mind it may only leak under pressure, and that pressure may cause it to squirt out - thus a lack of a very noticable fluid trail.
The issue may also be in one of the wheel cylinders. I would get a buddy to beat on the brake pedal while you crawl around looking for leaks. No fun, but it should get the job done.

Good luck,

Brenton