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there is no pressure regulator in the front brakes system. The harder you press the pedal the more braking action. There is an equaliser in the rear brake line to prevent rear lock up under moderate brakes and this is all over ridden by the ABS system when it sensors a locked wheel situation.
first most GM OEM systems will need to recognize the key first and foremost ,to do that you will need to roll window down on driver door,turn the key to the run position and with engine NOT running leave the key on for 10 minutes exactly ..then turn ignition off then try to start engine. if original system is working engine should start normally
this could be caused by a few things, first you need to jack the truck up you will need all 4 wheels off the ground, put the transmission in neutral and have some one get in the truck and wile turning each wheel have the person in the truck push the brake pedal the wheel should stop instantly then have the person release the brake the brake should release instantly,( do this to each wheel ) if all brakes remain locked ( wont release instantly ) then replace the master cylinder if the both rear brakes wont release instantly replace the brake hose from the frame to the rear differential, if the both front brakes wont release replace master cylinder, if only one front brake wont release open the bleeder on that brake caliper if the wheel releases replace the caliper hose if the brake still wont release with the bleeder open replace the caliper, you should replace the caliper and brake hoses as a pair.
hi, if the car has been sitting all this time with the parking brake on then the chances are your brakes are siezed on, now the parking brake locks the back wheels so this is where you should start looking for problems.
now the front wheels should be ok you can try them by jacking each wheel up and try spinning them by hand the front will be stiff but should turn with a bit of force.
how ever you could also jack the back wheels up to check they are solid if they are then you have two options the first would be to give the back wheels a few hits with a big hammer, you will need to hit them pretty hard and doing this should free the brakes enough for you to get the car moving. do this to both sides and you should find you can then use the car.
if after doing this they are still **** then your going to need to take the back wheels off and get a big hammer and keep hitting the back drum till the brakes free up, you wont be able to get to the brakes until they have freed up a bit as the brakes will be holding the drum onto the hub so you need to get them freed up first.
if you try forcing the car to much you can damage the drum at the back beyond repair so be warned.
hitting the middle of the back wheels with a sledge hammer will usually free the wheels up allowing you to move the car once it has started to move the brakes should free up over use.
your brakes wont be much good to start of with as they will be badly corroded so bare this in mind when driving.
you may need to hit the center of the wheels a few times then try moving forwards and backwards then you may need to hit the center of the wheel again, it may take a while but it will free up if you keep going.
The brake tech may have done something wrong or damaged a wheel sensor, take it back, if the problem started after the work on the brakes it is a safe bet they did something to cause the problem, one note as long as those warning lights are on the ABS and traction assist are disabled, no problem in dry weather, winter another thing.