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73-87 Chevy _ GMC Trucks => Brakes, Frame, Steering & Suspension => Brakes and Braking Systems => Topic started by: duallydmax06 on November 09, 2014, 03:08:13 pm
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Hello everyone, im working on a 84 gmc 1 ton crewcab dually 2wd with a 454 it has the hydro boost system on it and my problem is the other day the brake light came on and i lost power brakes the truck still stops you just have to press real hard now. The weird thing is the power steering still works great, acouple days ago i put some lucas power steering additive in for the leaky gear box that stuff slowed the leak down on my 85 so figured i try it on this one, anyone have a idea whats goin on here since the power steering still works????
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Those "fixes" swell rubber seals, OK for just power steering, probably not OK for the hydraboost unit...
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It acted up the same day the lucas stuff went in you think it did damage to the hydroboost that quick?
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Anyone else have any ideas???
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Make sure the master cylinder is full of fluid, check the rear drum brake adjustment and inspect the calipers, rear wheel cylinders and all brake lines for leaks.