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Brakes 2500 Suburban

serluk63

serluk63

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Location
Moscow, Russia
Help. Anybody. Suburban 2500 4x4. Some times roll and accelerates fine. But sometimes, as if someone is holding him. Slowly accelerates, poorly kept road. At first I thought that faulty brake hydro booster, changed it, replacing fluid like feel better, but then things got bad. I changed the wheel hub, brake discs, brake master cylinder, caliper, Ball joints. bushings. Bleed the brake booster, brake has blended. I changed what I could. The engine is working properly, grey PMD under the bumper, new turbo waste gate solenoid. There are no fault codes. If you go without traffic jams, that is not you press on the brake, then everything is fine. After stopping at a red light, if long, the machine starts to blunt, sometimes I tapped his toe on the brake pedal with the other side, it seems to me that to get better. Now the question I came back to the issue of the brake booster, can be restored amp bad? If pytalsya take what is new, or try again restored? When answering please note that sending me to Russia is very expensive.:(:(
 
serluk63 said:
Help. Anybody. Suburban 2500 4x4. Some times roll and accelerates fine. But sometimes, as if someone is holding him. Slowly accelerates, poorly kept road. At first I thought that faulty brake hydro booster, changed it, replacing fluid like feel better, but then things got bad. I changed the wheel hub, brake discs, brake master cylinder, caliper, Ball joints. bushings. Bleed the brake booster, brake has blended. I changed what I could. The engine is working properly, grey PMD under the bumper, new turbo waste gate solenoid. There are no fault codes. If you go without traffic jams, that is not you press on the brake, then everything is fine. After stopping at a red light, if long, the machine starts to blunt, sometimes I tapped his toe on the brake pedal with the other side, it seems to me that to get better. Now the question I came back to the issue of the brake booster, can be restored booster bad? Try to take new, or try again restored? When answering please note that sending me to Russia is very expensive.:(:(
Click to expand...
I have no idea. Only to change hydroboost again.
 
Check the return line from the hydroboost. If it is plugged or restricted the brakes will stay on as it slowly releases from fluid finally making it through the restriction.

Calipers can hang up. Likely the problem.
 
I have made hydroboost test. I stop engine, than depressed brakes. First time pedal went to flow. Second time went near flow. Then brakes become hard and move as usual. This was with hydroboost accumulator noise. Then I start engine with depressed brakes. I feel like described in test instruction. I want to know opinion about my first test. I repeated this test several times. The result was as I described. What with my brakes and hydrobooster.
 
Did you pull the calipers and make sure they slide easy?

Look for unusual wear on the rotors?

Could the emergency brake be hanging?

I've had both those problems in the not so distant past
 
jrsavoie said:
Did you pull the calipers and make sure they slide easy?

Look for unusual wear on the rotors?

Could the emergency brake be hanging?

I've had both those problems in the not so distant past
Click to expand...
New calipers, new rotors, emergency brake work (when engine stop, brakes work 2-3 times, but brake pedal can be depressed to floor, after 2-3 times, brake pedal become hard and not move to floor, it move as usual)
When I drive truck some times it move freely, some times move as something pull it back.
 
serluk63 said:
I have made hydroboost test. I stop engine, than depressed brakes. First time pedal went to flow. Second time went near flow. Then brakes become hard and move as usual. This was with hydroboost accumulator noise. Then I start engine with depressed brakes. I feel like described in test instruction. I want to know opinion about my first test. I repeated this test several times. The result was as I described. What with my brakes and hydrobooster.
Click to expand...

First, make sure the rear brakes are fully adjusted. Adjust them until they lock and then back them off until they just move. Badly adjusted rear brakes could explain the need to pump the pedal 2 to 3 times to get hard. If that does not work, thn consider replacing the master brake cylinder.

If you really want to improve the brakes on the Suburban, consider replacing the proportioning valve and installing the larger rear brake cylinders from the K3500 dually described in the following thread:

http://www.thetruckstop.us/forum/sh...-and-large-rear-Brake-Cylinders-on-my-99-Burb

Good luck.
 
Thanks to everybody. Especially to Big T. I decide to replace proportioning valve and rear brake cylinders.
I will report then.
 
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