How does one adjust the park brake on a 2003 Duramax 2500HD. All four wheels have disk brakes. I have traced the cable out and there is no adjustment on the cable except possibly within the rear brake assembly itself or at the emergency brake peddle in the cab of the truck.
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There is a cable that you adjust. If you pull the boot down around the base of the hand brake you will find that there is a cable with a threaded rod, turn the nut on the rod clockwise to tighten the brake, the proper adjustment is to have the brake handle start to engage the park brake when it clicks three times, if you are unable to reach this then you may have to adjust the part brake shoes at rear, there is a small slot at the backing plate of the brake at each well, there is be a little oval rubber plug in it, remove the plug and look inside you will see a little wheel with teeth on it, move that wheel with a flat blade screwdriver in a downward clockwise direction, with the wheel off the ground and the park brake off, when you fell just a little drag on the wheel the adjustment is correct, then recheck park brake adjustment as outlined above
Place parking brake lever in -full released- position.
Raise and support vehicle.
Remove plug in parking brake shoe support to access adjuster star-wheel.
Through the access hole, rotate the adjuster star wheel in the following direction to expand the shoes outward against the drum:
Left brake - Rotate star-wheel toward rear of vehicle.
Right brake - Rotate star-wheel toward front of vehicle.
Using an appropriate tool, turn adjuster star wheel until wheel will not rotate (dead lock).
Back off adjuster six detents (teeth).
Rotate wheel, checking for light drag. If drag is too heavy, continue to back off adjuster one detent at a time until light drag is present. Do not back off star-wheel more than 17 detents from wheel lock.
Install access plug.
Adjust opposite wheel parking brake shoes using same method.
Apply and release parking brake lever once to ensure proper operation of parking brakes.
Removal & Installation
The following procedure may be used to remove shoes on either side of the vehicle.
Lock out automatic adjuster in parking brake lever.
Raise and support vehicle.
Access and remove rear hub and bearing.
Remove parking brake cable bolt at knuckle.
Completely back off parking brake shoe adjustment.
Remove parking brake shoe adjuster spring.
Remove shoe adjuster.
Remove upper brake shoe hold-down clip and pin.
Remove lower brake shoe hold-down clip and pin.
Remove upper and lower shoes with return spring from shoe actuator.
Remove return spring from shoes.
Fig. View of the actuator (1), support (2), adjuster spring (3), return spring (4), caliper adapter (5), shoes (6), hold-down clips and pins (7) and adjuster (8)
Install return spring between upper and lower shoes.
Before installing shoes on actuator, make sure actuator hooked to rear cable is positioned with word -UP- facing outward.
Install upper and lower shoes with return spring on shoe actuator located on parking brake cable.
Install lower brake shoe hold-down pin through rear of support and lower shoe, then install hold-down clip.
Install upper brake shoe hold-down pin through rear of support and upper shoe, then install hold-down clip.
Install shoe adjuster. Place end of adjuster with star wheel upward.
Install parking brake shoe adjuster spring.
Install bolt securing parking brake cable to knuckle and tighten bolt to 21 ft. lbs. (28 Nm).
Using Brake Shoe Gauge, Special Tool C-3919, or equivalent, measure inside diameter of parking brake drum portion of rotor.
Place Gauge over parking brake shoes at widest point.
Using adjuster star wheel, adjust parking brake shoes until linings on both park brake shoes just touch jaws on gauge. This will give a good preliminary adjustment of parking brake shoes, before a final adjustment is made at end of this procedure.
Install hub and bearing with wheel speed sensor as well as all components necessary to access it.
Unlock automatic adjuster in parking brake lever.
Perform final adjustment of parking brake shoes
This vehicle is equipped with permanently sealed rear wheel bearings. There is no periodic lubrication or maintenance recommended for these units.
Removal & Installation
Raise and support vehicle.
Remove wheel mounting nuts, then tire and wheel assembly.
If equipped with AWD:
Remove cotter pin, nut lock and spring washer from half shaft.
While a helper applies brakes to keep hub from turning, remove hub nut and washer.
Remove brake caliper and rotor from hub and bearing assembly.
Fig. Hub assembly
Disconnect vehicle wiring harness connector at wheel speed sensor connector.
Unclip wheel speed sensor connector from spare tire mounting support.
Disconnect two sensor cable routing clips on rear suspension crossmember.
Disconnect two sensor cable routing clips along toe link.
Disconnect sensor cable from bracket on brake support.
Completely loosen, but do not remove four bolts fastening hub and bearing in place. Once loosened from threads in hub and bearing, push bolts up against rear of hub and bearing to keep brake support plate in place when hub and bearing is removed.
Fig. Rear hub and bearing mounting bolts
Pull hub and bearing off knuckle and half shaft (if equipped with AWD), then thread wheel speed sensor cable through hole in brake support plate as it is removed with hub and bearing.
Position hub and bearing bolts though rear of knuckle and parking brake support just enough to hold support in place as hub and bearing is installed.
Install hub and bearing by first feeding end of wheel speed sensor cable through hole in bottom of parking brake support. As this is being done, if equipped with AWD, slide hub and bearing onto half shaft. Place hub and bearing through brake support, onto knuckle, lining up mounting bolt holes with bolts and placing wheel speed sensor head at bottom.
Install four bolts fastening hub and bearing in place. Tighten mounting bolts to 60 ft. lbs. (81 Nm).
Place wheel speed sensor cable routing grommet into bracket on parking brake support.
Route wheel speed sensor cable along toe link and rear suspension crossmember connecting routing clips where shown.
Connect vehicle wiring harness to wheel speed sensor connector.
Install brake rotor and caliper.
If equipped with AWD:
Install washer and hub nut on end of half shaft.
While a helper applies brakes to keep hub from turning, tighten hub nut to 180 ft. lbs. (244 Nm).
Install spring washer, nut lock and cotter pin on end of half shaft.
Install tire and wheel assembly. Install and tighten wheel mounting nuts to 100 ft. lbs. (135 Nm).
You cannot adjust the cables on a minivan manually. the tension is
automaitcally adjusted by the self adjuster on the pedal release.
The park brake cables on this vehicle have an automatic self adjuster
built into the park brake pedal mechanism. When the foot operated park
brake pedal is in its released (upward most) position, a clock spring
automatically adjusts the park brake cables. The park brake cables are
adjusted (tensioned) just enough to remove all the slack from the
cables. The automatic adjuster system will not over adjust the cables
causing rear brake drag.
Due to the automatic adjust feature of the park brake pedal, adjustment
of the parking brake cables on these vehicles relies on proper drum
When the park brake pedal is applied the self adjuster is by-passed and the pedal operates normally to engage the park brakes.
When a service procedure needs to be performed on the park brake pedal
or the park brake cables, the automatic self adjuster can be manually
locked out by the service technician.
you mean parking brake cable? loosen parking brake cables put drums on , and adjust shoes till they lightly drag, now apply brakes a few times and check the adjustment again, if all ok, now adjust park brake cables, you want to adjust so park pedal goes 5-8 clicks till the wheels are "locked up" and the wheels spin free with the park brake off
The adjuster is just like on a car with drum brakes. It can be adjusted with the wheels still on the truck, but if yours is out enough that it doesn't work, an inspection is warranted. Axle seal failure is common and will soak the shoes.
Jacked both rear wheels off ground, and while slowly spinning wheel, tighten the star-wheel adjuster until you just hear and feel brake drums rubbing, then loosened slightly. There's a plastic dust cover about 1/4" X 1" that you remove, and use a drum brake adjuster tool.
The driverside access hole is below axle, easily accessable. To tighten driver side rear parking brake, turn star-wheel adjuster down.
The passengerside access hole is found above axle, and difficult to see. Removed pass side wheel and used an inspection mirror. To tighten passenger side rear parking brake, turn star-wheel adjuster up.
Good luck and hope this helps. Oh and the other thing to is that if you do smell axle fluid around the wheels and see oil leaking from the drum area. Then you have a axle wheel seal and or bearing gone bad too.
Hope this helps. This is out of the factory manual. Let me know if this works for you.
NOTE: Tensioner adjustment is only necessary when the tensioner, or a cable has been replaced or disconnected for service. When adjustment is necessary, perform adjustment only as described in the following procedure. This is necessary to avoid faulty park brake operation.
Fully back off cable tensioner adjusting nut at equalizer to create slack in cables.
Remove rear wheel/tire assemblies. Remove brake calipers and rotors.
Verify park brakes are in good condition and operating properly.
Verify park brake cables operate freely and are not binding, or seized.
Check park brake shoe adjustment.
Reinstall rotors and make sure rotors turn freely.
Ahh they are a real pain in the **** you need to remove the rear wheels calipers caliper anchors then the rotors and then you can adujust the park brake shoes up just untill you feel a bit of drag on the rotor then back them off a bit. Other wise you need to buy the tools to check the adjustment bottom line they are a pain