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Old 12-06-2014, 09:55 AM   #11
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Thought I would add this info also.

While in park you can press the brake pedal and hold it and as the pedal goes down due to not holding under pressure the brake light comes on.

The brake fluid leaves the master cylinder goes thru a proportioning valve then the fluid for the front goes to the calipers and the fluid for the rear goes thru a RWAL module then to rear wheel cylinders.

Since the brake light is coming on could there be something going wrong with the RWAL ? Not sure how that works or what is triggering the light to come on.
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2013 Jayflight 32bhds , Outside kitchen,Bike/Cargo rack,thermal pkg,elite pkg,elec stab jacks,outside grill,pwr awning,roof ladder,hideabed sofa,technology pkg,15k btu A/C upgrade,8,367lbs dry wt
1994 Chevrolet Crew cab dually 6.5td,auto,silverado
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Old 12-06-2014, 02:32 PM   #12
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Originally Posted by turbo-power View Post
Ok , I had the DW push on the brake pedal and hold it and I checked the 2 front hoses and the 1 rear hose and I did not see any swelling or ballooning while under pressure. So I replaced the master cylinder and that did not correct the problem either.
So back to square one. Should I replace the hoses ? If that does not fix it then what ? There is no brake fluid leaking anywhere its just not holding pressure. Thanks for any advice.

I believe the problem with the brake hoses on those Chevy trucks is that they swell on the inside. It's a common problem on the Chevy trucks from that era. I had to replace the front hoses on a '92 half ton truck that I had. The symptom on that track was that the caliper would not release.

Have you replaced all of the fluid in the system? I went to a seminar given by one of the brake parts manufacturers a few years ago, and one of the things they brought up is that the brake fluid on that era of GM truck needs to be replaced from time to time to prevent damage to the antilock unit by the fluid.

While we're on the subject of the antilock unit, it is worth noting that when you press the peddle, you are not really in direct contact with the system. The antilock unit controls what is applied to the system.

Hope this info helps.
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Old 12-06-2014, 05:59 PM   #13
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I have not yet bleed the system completely yet . That's the next thing I will do before replacing anything else and make sure there is no air in the system and all fresh fluid.
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2013 Jayflight 32bhds , Outside kitchen,Bike/Cargo rack,thermal pkg,elite pkg,elec stab jacks,outside grill,pwr awning,roof ladder,hideabed sofa,technology pkg,15k btu A/C upgrade,8,367lbs dry wt
1994 Chevrolet Crew cab dually 6.5td,auto,silverado
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Old 12-06-2014, 06:11 PM   #14
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I am not sure if you have checked pads and shoes ... I had my right rear shoe shot and mine were spongy because it was over extending the cylinder on that wheel
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