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Car Forum / GMC Cars / January 2006low pedal
1990 buick century. I have replaced the master cylinder and rebuilt the calipers in front and 1 new wheel cylinder(due to leak) and still have a low brake pedal. Feels like I bottom the pedal to stop quickly. I am fairly confident all the air is out. rear shoes feel adjusted properly although their must be a slight out of round on the drum since it catches at some points when spinning. Any suggestions on where to look would be appreciated. The total pedal travel is about 2.1" to firm pedal, slightly further and I feel like the master bottoms? total pedal travel to floor is 4" -- toddtech Brake hose ? > 1990 buick century. I have replaced the master cylinder and rebuilt the > calipers in front and 1 new wheel cylinder(due to leak) and still have a [quoted text clipped - 5 lines] > slightly further and I feel like the master bottoms? total pedal travel > to floor is 4"+ > 1990 buick century. I have replaced the master cylinder and rebuilt the calipers in front and 1 new wheel cylinder(due to leak) and still have a low brake pedal. Feels like I bottom the pedal to stop quickly. I am fairly confident all the air is out. rear shoes feel adjusted properly although their must be a slight out of round on the drum since it catches at some points when spinning. Any suggestions on where to look would be appreciated. The total pedal travel is about 2.1" to firm pedal, slightly further and I feel like the master bottoms? total pedal travel to floor is 4"+ Perhaps the rotors and rear housing are worn down?  SignatureThank you, CL Gilbert "Then said I, Wisdom [is] better than strength: nevertheless the poor man's wisdom [is] despised, and his words are not heard." Ecclesiastes 9:16 > > 1990 buick century. I have replaced the master cylinder and rebuilt the calipers in front and 1 new wheel cylinder(due to leak) and still have a low brake pedal. Feels like I bottom the pedal to stop quickly. I am fairly confident all the air is out. rear shoes feel adjusted properly although their must be a slight out of round on the drum since it catches at some points when spinning. Any suggestions on where to look would be appreciated. The total pedal travel is about 2.1" to firm pedal, slightly further and I feel like the master bottoms? total pedal travel to floor is 4"+ > > Perhaps the rotors and rear housing are worn down? That would not affect pedal travel if the rears were properly adjusted. > 1990 buick century. I have replaced the master cylinder and rebuilt the calipers in front and 1 new wheel cylinder(due to leak) and still have a low brake pedal. Feels like I bottom the pedal to stop quickly. I am fairly confident all the air is out. rear shoes feel adjusted properly although their must be a slight out of round on the drum since it catches at some points when spinning. Any suggestions on where to look would be appreciated. The total pedal travel is about 2.1" to firm pedal, slightly further and I feel like the master bottoms? total pedal travel to floor is 4"+ > > -- > toddtech Sure sounds like air in the system. Try a vac bleeder. Why not replace the one old rear wheel cylinder while you are at it? On 1/21/06 8:57 PM, in article toddtech.221e5t@no-mx.carstalk.net, > 1990 buick century. I have replaced the master cylinder and rebuilt the > calipers in front and 1 new wheel cylinder(due to leak) and still have a low [quoted text clipped - 4 lines] > The total pedal travel is about 2.1" to firm pedal, slightly further and I > feel like the master bottoms? total pedal travel to floor is 4"+ Did you bench bleed the new mc? > 1990 buick century. I have replaced the master cylinder and rebuilt the calipers in front and 1 new wheel cylinder(due to leak) and still have a low brake pedal. Feels like I bottom the pedal to stop quickly. I am fairly confident all the air is out. rear shoes feel adjusted properly although their must be a slight out of round on the drum since it catches at some points when spinning. Any suggestions on where to look would be appreciated. The total pedal travel is about 2.1" to firm pedal, slightly further and I feel like the master bottoms? total pedal travel to floor is 4"+ > > -- > toddtech Does this vehicle have ABS and did you bleed the ABS with the proper procedure? (requires scan tool) good luck nate Thanks for all the ideas. I have put my hands on the brake hoses while an assistant has pressed the pedal hard. I felt no expansion of any hose. I suppose this is a sufficient test for hoses? Note: this is not an ABS vehicle. So to further my troubleshooting, I have put hose locks on the hoses to stop passage of fluid thru them. Then stepping on the pedal, it goes down 7/8" then becomes rock hard. So that seems to rule out air anywhere from the master to the line locks. That leaves only the possibility of air from the line locks to the wheel cylinders and calipers. I have done normal bleeding, gravity bleeding and pressure bleeding on this system. I must say that I feel confident the air is gone. The only other thing I can think of is that maybe the drums are out of round more than I think causing a poor adjustment on the rear drums, thus causing excessive brake shoe travel. I still don't think this is it because I checked the drum with a caliper and it seemed close. Oh, the booster on this vehicle does not have an adjustment on it for petal travel. I have done some checking on this avenue and everything seems to be the proper length without depressing the master piston nor being too short. It just seems like the excesses in wheel cylinder pistons and caliper travel create this trouble -- toddtech |
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