Question about 1991 GMC C1500

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91 gmc half ton front brakes

What is the torc size to take off the front caliber

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It should be 3/8 allen wrench to remove pads & 13 or 9/16 metric to get off calipers. I have a GMC Suburban & I have to have both metric & standard to work on it.

Posted on Dec 04, 2008

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89 half ton front brakes


You will need a SHOP MANUAL.

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Is my 1995 GMC Sonoma 4x4 a half ton truck


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1993 GMC Sierra 1500 both front brakes not releasing after letting off brake


look at your front brakes you have a brake caliber, on it you will see a piston that pushes your brake pads in when you apply your brakes sounds like your piston on brake caliber is sticking.they have rebuild kits at your local parts place hope this was useful.

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Im bleeding the breaks on a 91 chevy c1500 the front calipers are locking down and not releaseing


First thing to check is the slide pins on the calibers. Make sure they are clean and free of any rust. If not, replace them. If they are not rusty then clean & lubricate them with a very small amount of grease. Your brake system on this vehicle is 20 years old. Have you ever changed the brake fluid? If you are like most people the answer is no. I recommend you flush the entire brake system and install fresh DOT3 fluid. Look closely at the flexible brake hoses that connect to the caliber. They may be collapsing and I recommend you replace them on a 20 year old vehicle. I would also recommend you replace the calibers on the front. With new calibers, brake lines, and fresh fluid you should have great brakes. If you still have the problem replace the master cylinder.

May 27, 2011 | 1991 Chevrolet K1500

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I have a 1997 chevy cavalier. I replaced wheel cylinders, brake lines, front calibers master cylinder and booster. When I bleed the brakes I only get brake fluid from the front bleeder on the ABS system. I...


sometimes if you leave the bleeder screw open it will gravity bleed the cylinder.Make sure master cyl is full and do one wheel at a time.I have seen this work, I have done it.

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1 Answer

How do you remove the front disc brakes?


To remove the front disc brakes , you must remove the break caliber assembly . Keep in mind that on some brake calipers a special Torx Drive T40 or T45 must be used to remove the caliber bolts from the spindle assembly . Also , Allen (Hex) bolts are sometimes used . Be sure you have the right tools .
1. Properly block both rear wheels at the front in the back of each wheel.
2. Loosen the lug nuts on both front wheels one turn on each nut.
3.Jack up and support the front of the car on Jack stands with the wheels one to 2in. off the ground.
4. Remove the two bolts on the inside of the caliber the secure it to the spindle .
5.Once the bolts have been removed the caliber should pull straight away from the rotor and spindle assembly .
6.Remove your old brake pads , clean the assembly , properly lubricate the moving parts as necessary , especially the floating sleeve as the assembly is called a floating caliber which means half of the Caliper is bolted to the spindle (inner) but the other half floats (outer).
7.Use a large see clamp centered between the caliper piston and caliper housing to push the piston all the way back into the caliber cylinder by turing (1 turn at a time) the screw until the piston is flush with the caliber face .
8. Install your new brake pads .
9. use the reverse procedure to assemble everything back together. Good luck and be safe....

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Brakes need to be bled


Back to front.....rear passenger first then rear driver's....then pass front and then driver's last.

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Gravity bleeding doesnt usually work real well.

Get a clear jar of some type, and a piece of 1/4 inch vacuum hose about 18 inches long. Put about 2 inches of new brake fluid in the container.

Start at the passenger rear wheel, losen the bleeder, slide the hose tightly over the open bleeder, the other end in the jar where you can see the hose end.
Fill master cylinder reservoir.

Pump brake no more than 4 times, watching the hose end in the jar for bubbles. After 4 pumps, check reservoir, refill. Pump 4 more times. Watch for bubbles. Check reservoir, pump 4 more times. If you see bubbles at any time, then keep going through the above steps until you stop seeing bubbles.

Go to rear wheel, tighten bleeder. Go to driver rear wheel, and do the same thing, although this time it won't take but 4-6 pumps to purge any air.

Go to passenger front, repeat.
Go to driver front, repeat.

Do not recycle any of the fluid.

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1 Answer

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jack the truck up and take the passangers tire off. look behind the rotor you should see 2 bolts holding the caliber on to the rotor. loosen those and take them out. from there you should be able pull up on the caliber this will take the caliber and pads off together. take the pads out of the caliber and install the new ones .

BECAREFUL not to twist or bend the caliber to much or you will bend the brake line.....

once you have installed the new brake pads in the caliber. put the caliber back on the rotor. if they will not fit release the bleader valve to release the pressure. than you should be able to slid the caliber back onto the rotor. once you have done that close the bleader valve. reinstall the 2 bolts to hold the caliber in place. put your tie back one. Follow these steps for the other side.

now once that is done. you might want to blead the front breaks.
what you do is have someone help you. fill the brake resiviour with brake fliud. than start your truck.
Have someone in the cab to press the brake. What you want to do is turn the wheel so you can get to the bleader valve. once you can get to it open it up. have the person in the cab other truck press the brake until you see a steady flow of brake fluid coming out of the caliber. once you see that have the pseron press the brake once more and hold it to the floor.
close the bleader valve.

now do the same thing on the other side. But, make sure you check your resivour fluid first.
This is to make sure you don't have any air in the lines. after you are done with both side put it in gear and hit the brake make sure you stop......... If that works go about half the block down and hit the brake again to make sure you stop......
once you have done that and are comfortable with the way the truck stops than ou are good to go and now know how to change the brakes for future refrence..... be awar the back brakes are diffrent.........

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1 Answer

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