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master cylinder on 98 silverado
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bdogy1
New User
Mar 22, 2009, 7:58 AM
Post #1 of 6
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master cylinder on 98 silverado
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i just replaced the main brake line that feeds the rears. all is good now except that it sounds like the master cylinder is sucking air when i press the pedal down to pump them up. i have a pretty hard pedal but i just wonder if the master cylinder is not sealed good or if this is a normal sound?
(This post was edited by bdogy1 on Mar 22, 2009, 8:47 AM)
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Loren Champlain Sr
Veteran
/ Moderator
Mar 22, 2009, 9:18 AM
Post #2 of 6
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Re: master cylinder on 98 silverado
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If you are hearing a vacuum type noise during pedal depression, the power brake booster may be leaking. This would account for a 'hard' pedal. It would be like trying to stop without the engine running. With the engine running, transmission in park (neutral with e-brake set if manual trans), press on the brake pedal with your hand while you have your head under the dash. Listen for a constant 'sucking' noise while the pedal is depressed.
Does the brake pedal have the normal amount of travel, as before? There is a difference between a 'firm' pedal (as in no air in system) and a 'hard' pedal (as in no power assist). Hard to describe.
Loren
SW Washington
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bdogy1
New User
Mar 22, 2009, 9:30 AM
Post #3 of 6
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Re: master cylinder on 98 silverado
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well the it has a firm pedal pretty much normal but wheb i press the brake with the engine off i hear that sound like you said an air leak or something but are there seals under the master cylinder that can be replaced or can it be tightened down or do i need to replace power booster or whatever its called? i have good brakes now and im not to worried but i am alittle bit puzzled by that shhhhh sound. it just doesnt sound right to me
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Loren Champlain Sr
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/ Moderator
Mar 22, 2009, 9:32 AM
Post #4 of 6
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Re: master cylinder on 98 silverado
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With the engine off, that is a normal sound. Not to worry.
Loren
SW Washington
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bdogy1
New User
Mar 22, 2009, 9:51 AM
Post #5 of 6
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Re: master cylinder on 98 silverado
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thanks so much i guess i wont worry about that. the truck has 155k and i just wanted to make sure it was ok. the brakes work fine anyway now
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Guest
Anonymous Poster
smorenski@yahoo.com
Apr 19, 2009, 5:57 AM
Post #6 of 6
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Re: master cylinder on 98 silverado
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I also have the same vehicle and i just put in coil spacers in the front and i went to bleed the brakes and it sounds almost like gargling coming from the master cylinder area.i switc\hed the tops from my other truck thinking it might have been that but no luck.When i bleed the brakes all fluid comes out but the pedal just doesn't feel stiff like it should be,It goes near the floor.Have any ideas?
Thanks,Steve
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