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Brakes not releasing


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CDREANDRADE's Avatar
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May 23rd, 2011, 6:01 PM   #1  
Brakes not releasing

I have new rotors, calipers, pads, and bearings.

When I apply pressure to the brakes they will not release. If I open the bleeder screw they release. As far as I can tell its only the front. I did already bleed the whole system as well.

The brake system is all the same as a chey 1 ton of the same or similar year. It has the bendix type calipers w/ hydro-boost.

I have never worked on a hydro-boost so there may be something I am missing, or its the master cylinder. Just wanted a second opinion before replacing it.

it is a 78 g30 motorhome dually


Last edited by CDREANDRADE; May 23rd, 2011 at 6:05 PM.
 
OLD WRENCH's Avatar
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May 24th, 2011, 10:58 AM   #2  
Sometimes the hoses can fail and act as a check valve.Try opening the lines at various points to locate the restriction.

 
CDREANDRADE's Avatar
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May 24th, 2011, 9:01 PM   #3  
Posted By: OLD WRENCH Sometimes the hoses can fail and act as a check valve.Try opening the lines at various points to locate the restriction.
Is there a solution I could run through the lines or just unhook and let gravity bleed or pump through?

It did seem like it was taking excessive pressure to stop abruptly.

 
OLD WRENCH's Avatar
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May 25th, 2011, 9:30 PM   #4  
Nothing I know of.

 
CDREANDRADE's Avatar
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May 26th, 2011, 4:42 PM   #5  
It was indeed both front brake hoses were bad. Thanks for your help.

Chris

 
OLD WRENCH's Avatar
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May 27th, 2011, 8:29 AM   #6  
Thanks for lettin us know. For future reference the rubber parts on something that sets around fail rather fast. Keep an eye on hoses,belts,and tires.

 
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May 27th, 2011, 8:39 AM   #7  
84 305 wont run well with coolant sensor

I am new and cant figure out how to post!84 Impala 305 4 barrel 70,000 ACTUAL mi.wont run well with coolant sensor hook up dead miss and loss of power, unhooked runs much better at about 90 %,,,,if you can start me in the right direction i would appreciate it.Will not run good with replacement of TX1,2 wire sensor.I wonder if i found wire for new TX1 temp. sensor would it fix it,ALSO IS THIS POSTED IN THE RIGHT PLACE


Last edited by rogo; May 27th, 2011 at 7:56 PM. Reason: more info
 
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May 27th, 2011, 10:53 AM   #8  
Thanks for good info here.

 
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