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I have a 2004 chevy colorado andnafter replacing front calipers brake lines and the master cylinder my front brakes still.lock up.

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Did you bleed out all of the brake lines? In case you didn't, since your vehicle has a split diagonal setup, you'll want to bleed the front first, then go opposite side, rear. Repeat same way, on the other two tires. Hope this helps! Just a reminder to check for any recalls, by law, no matter how old your vehicle is, Chevrolet has to fix it.

Posted on Nov 08, 2014

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Does it pull to one side? Or do both lock at the same time?

Posted on Nov 08, 2014

  • Levi Manning Nov 08, 2014

    They both lock at the same time

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  • Cars & Trucks Master
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Look at the ABS system and also check that proportion valve is working

Posted on Nov 08, 2014

  • steve h woody Nov 08, 2014

    sorry i forgot ttell you t go o autozone librar ,i was just there and there is a section on auto bleading te abs system te AZ site is allways free and no spam , just log in and list your vehicle and go to repair help and follow it to vehicle repair guide and then to bakes , found it very helpfull in th past. Woody

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Posted on Jan 02, 2017

dxg031603
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SOURCE: 1986 gmc sierra 1500 front rt brake locks up

check brake lines they may have gotten pinched very commonok new c/k trucks when you crank the torsion bars up to far you may have hit something and pinched the brake line check those before messing with the master cylinder those are a real pain

Posted on Sep 21, 2008

c17hydro
  • 2984 Answers

SOURCE: 1996 PLYMOUTH VOYAGER SOFT BRAKE PEDAL AIR IN LINES

I am a hydraulic technician and I can tell you that air is a killer in the hydraulic system.

Start from the rear and work your way forward. I f you are using the two person method, make sure the second person keeps the master cylinder full. If the fluid level dropped anywhere in between pressing and releasing the brakes....you have a lot of air in the system.

Make sure you are tightening the bleed valve when the brake pedal is full pressed.

Remeber...start from the rear brakes first, then do the front.

Posted on Mar 16, 2009

dr_greg
  • 192 Answers

SOURCE: 2004 honda crv brakes are

check to see if the rubber bushing is on the master cylinder pushrod where it bolts up to the booster..if its missing and or doubles , it may cause u to lock ur brakes up..i had this problem where the tech didnt put one and or didnt remove one while installing the new master cylinders...there should only be one. most factory and aftermarket mast cyl come with one however techs sometimes for get to check the booster for the old one some assume its still there cuz they always almost get stuck in there..so they install the new master cyl.without one or with one and either they have none..or both...it only needs one...

Posted on May 12, 2009

rsst
  • 175 Answers

SOURCE: front brakes stay locked up

You may want to replace your flexible feed lines to the calipers. Any little bit of **** in them will not let the brake fluid out of the caliper,

Posted on Jul 29, 2009

  • 1 Answer

SOURCE: Brakes are still spongy after changing the pads, one caliper, and master cylinder. bled front brakes.

I just went to Brake Masters this morning and had them replace the Master Cylinder since I was experiencing the pedal very spongy and going to the floor. When they replaced the Master Cylinder and they gave me back the car, the brakes were still spongy and going to the floor. I addressed this to them and they took another look at it, but when I took it for a second time, the brakes were extremely spongy. It was almost like they gave me back my car in worst condition to when I brought it in. Can you help?

Posted on Jul 31, 2010

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2004 chevy colorado...100,000 miles. The brakes are fine when you first begin to drive, but after 10-15 minutes, both front wheels begin to brake. They have not locked up, but have a lot of resistance. I...


A kink in a hardline would result in a pair of them getting locked up, but not all 4. The kink allows pressure from the master cylinder through to the calipers, but won't allow it to release back to the master cylinder though in your case maybe it is allowing some pressure back which is why they aren't fully locking up. The result is that with each pump of the pedal you are locking more and more pressure into your calipers until they lock up. Opening the bleeder screw releases this pressure, then it starts all over again. So this would be the first thing to look into.

Let me know how this works out for you.


Benjamin

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There are times when the rubber brake lines start to come apart internally and act like a one way valve. they let the fluid in, but will not let it out.

Try this: The the brakes are locked up release the bleeder on the caliper. if pressure come out there, lock up again, and release the hose where it goes into the metal line. This may be hard because of rust, but you will probably have to replace the line anyway.

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I assume you mean that you replaced the front pads and rear shoes. Or did you also replace the disks and drums?? Either way you should be ok unless you also replaced the slave cylinders on the rears.
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You may want to replace your flexible feed lines to the calipers. Any little bit of **** in them will not let the brake fluid out of the caliper,

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