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Old 11-11-2005, 09:33 AM
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My 86 cutlass has front discs and rear drums. A while back I replaced the rear wheel cylinders, the master cylinder and flushed the system. ever since then the car has little brakes, the front brakes hardly work at all, but the back brakes are okay. I know it needs a new combo valve, the one on it is no good and nobody makes a replacement. I can bleed the front brakes and a almost full pedal returns, but the brake light will be on the entire time, press the brake pedal hard, the combo valve will go "POP", the light goes out, and the pedal goes almost back to the floor again with the same result of back brakes but very little front brakes. I`ve bled them countless times so I know it doesn`t have air in the lines. I`ve got to fix this before it gets me in a wreck if I have to panic stop like it almost did 2 days ago. Is a aftermarket unit going to be my only option? I`d rather spend the cash on a aftermarket unit than try and dig in the bone yard and find one just as worn out as mine. Any help is appreciated.

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Old 11-11-2005, 10:50 AM
abstruse dutch uncle
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I think there was a service bulletin regarding the combo valve for that model. The service replacement is available. The original could leak fluid out, or air in. Make sure you have no leaks besides it.

The GM # is 25509419 and the Delco # is 172-1353. It's about $45 and is brass.
You can get it from you local dealer,,,, and maybe a few other places. Many of the aftermarket companies sell this same valve for much more. There are many other similar OE valves available, but this one is the least expensive so it's what they use.

Last edited by yesgo; 11-11-2005 at 11:03 AM.
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Old 11-11-2005, 01:51 PM
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Much thanks to you Yesco, I read up on it and your right, seems these were prone to go bad, no wonder it`s never really had good brakes.
Much appreciate it.
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