72 brake booster - The 1947 - Present Chevrolet & GMC Truck Message Board Network

katyjevoich76 · 02-22-2010, 05:48 PM

I think my power booster might be bad but Im not sure how to test it.My truck has a dana 60 up front with the original booster and master cylinder.My problem is I have a hard pedal and the brakes dont lock up unless its slick or you put both feet on the pedal.The pedal is harder than manual brakes but not as hard as power brakes with the motor off.

Myself · 02-23-2010, 02:45 PM

Sounds more like a blockage somewhere. Start by using a handheld vac pump on the booster. It should suck in and hold a vacuum. If that's ok then bleed your brakes. Brake fluid absorbs moisture, then rusts and corrodes the brake lines from the inside. A piece of rust could be blocking a line. Start at the back and work to the front. Bleed the brakes until clean fluid comes out.

02-22-2010, 05:48 PM	#1
katyjevoich76 Registered User Join Date: Jan 2010 Location: salinas,ca. Posts: 29	72 brake booster I think my power booster might be bad but Im not sure how to test it.My truck has a dana 60 up front with the original booster and master cylinder.My problem is I have a hard pedal and the brakes dont lock up unless its slick or you put both feet on the pedal.The pedal is harder than manual brakes but not as hard as power brakes with the motor off. Last edited by katyjevoich76; 02-22-2010 at 05:50 PM.

02-23-2010, 02:45 PM	#2
Myself Registered User Join Date: Oct 2005 Location: Northern Arkansas Posts: 1,131	Re: 72 brake booster Sounds more like a blockage somewhere. Start by using a handheld vac pump on the booster. It should suck in and hold a vacuum. If that's ok then bleed your brakes. Brake fluid absorbs moisture, then rusts and corrodes the brake lines from the inside. A piece of rust could be blocking a line. Start at the back and work to the front. Bleed the brakes until clean fluid comes out.



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