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Old 03-16-2012, 01:42 PM
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Low Brake Pedal

I've got a 1980 Grand Lemans and a 1980 GMC Cabellero (same as an El Camino). Same brake systems. The brake pedal on the Cabellero is way too low. It's been that way since I purchased the car 10 plus years ago and went through brakes then. I just replaced the calipers, master cylinder, and front brake hoses. The rear shoes are only a month or so old. The rears are adjusted so there is a slight scrapping sound when the wheels are turned. The space between the brake booster rod and the master cylinder piston pocket is .009+/-. There is no adjustment for the rod between the brake pedal arm and the booster. It's not air in the system. I replaced the rear brake adjusters when I replaced the shoes with the hope the self-adjusters were not doing thier job.
I made the recent repairs because of another problem. The left front caliper hose was stopped up. I've never had this happen so I may have changed some things that didn't need replacing. There were several clues but I tought the caliper had gone bad even though it wasn't leaking. I found black gunt in the master cylinder resevoir.
Any suggestions would be appreciated. The shop manual isn't any help.
Ossie

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Old 03-16-2012, 07:54 PM
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were the rear drums turned when you put in the new shoes?
I usually adjust up the rear drums so that with a good spin the wheel only goes arounf once. That usually brings the pedal up.
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Old 03-16-2012, 08:38 PM
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BRAKEs

No, I ddin't turn the drums but the pedal was low before that. The pedal was low when I put new drums on it a few years ago. I'll try adjusting the shoes a little tighter. It looks like the adjusters would take care of that area.
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Old 03-16-2012, 09:03 PM
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When you are adjusting the rears are you first adjusting them until the tire and wheel will not turn? If not try adjusting them tight and then adjust them a equal amount ( count the stroke number of your brake spoon) on booth side until they rotate like Bob said. After that adjust your emergency brake. Do you have a hard petal?
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Old 03-17-2012, 12:59 PM
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Brakes

I adjusted the parking brake in accordance with the shop manual. It sounds like I need to adjust the rear brakes a little tighter. An old neighbor told me years ago to depress the brake pedal periodically while adjusting the brakes. This centers the shoes in the drum. I'll try all this together.
Thanks guys.
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