In recent mandatory state vehicle technical inspection this defect was found when testing braking force. The test indicated that left wheel was 0.75 and right wheel 1.26. What could be causing the lower braking ability on left side?
What year is this car 97 cant be correct,what state requires brake pressure test?/get a second test done some where else unless this car pulls or you have noticed a problem/or replace the left rear caliper if you beleave the test are correct
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Well, yes. Perhaps I have an answer for you.
First, please share your year, make, and model of vehicle.
Next, my first experience with this problem was in the year 1997.
It turned out the problem was collapsing rubber-hose brake fluid lines.
They were closing up on the inside, even though the outside was perfect.
The vehicle was only 6 years old, so it was a manufacturing defect. Since then, I also found this problem a few years ago on another vehicle by another manufacturer.
God bless your efforts.
The easiest way is to pull the wheels and the drum and adjust the self adjuster at the bottom (it is a threaded affair with a sprocket on it at the bottom of the assembly). They sell a tool to adjust this without pulling wheels, but I always found it easier to do it with the wheels removed which allows inspection of the self adjuster and springs and brake "nails". Adjust the pads until they just touch the drums and then back them off a little. push the brake pads together before reinstalling the drum, spin the drums to make sure they aren't scrubbing, reinstall wheels and take for a test drive to make sure the pads are seated and recheck if necessary. It sounds complicated but the hardest part is taking off the wheels and drums. Hope this is useful.
Before servicing the vehicle, refer to the precautions in the beginning of this section.
Raise the vehicle.
Remove or disconnect the following:
Rear tire and wheel assembly
Brake drum retaining clips (if equipped).
NOTE: If the drum does not come off, further brake clearance can be obtained by backing off the brake automatic adjuster screw. Remove the rubber plug from the top of brake support plate. Rotate the automatic adjuster screw in an upward motion, using a screwdriver. To Install:
Raise and safely support the vehicle with jackstands.
Mark the relationship of the wheel to the axle flange to help maintain wheel balance after assembly.
Remove the tire and wheel assembly.
Mark the relationship of the brake drum to the axle flange.
CAUTION Do not pry against the splash shield that surrounds the backing plate in an attempt to free the drum. This will bend the splash shield.
If difficulty is encountered in removing the brake drum, the following steps may be of assistance.
Make sure the parking brake is released.
Back off the parking brake cable adjustment.
Remove the access hole plug from the backing plate.
Using a screwdriver, back off the adjusting screw.
Install the access hole plug to prevent dirt or contamination from entering the drum brake assembly.
Use a small amount of penetrating oil applied around the brake drum pilot hole.
Carefully remove the brake drum from the vehicle.
After removing the brake drum it should be checked for the following:
Inspecting for cracks and deep grooves.
Inspect for out of round and taper.
Inspecting for hot spots (black in color).
Install the brake drum onto the vehicle aligning the reference marks on the axle flange.
Install the tire and wheel assembly and hand-tighten the lug nuts.
Carefully lower the vehicle, then tighten the lug nuts to 100 ft. lbs. (140 Nm).
Inspect the brake system for leaks and visual damage.
Inspect the battery state of charge.
Install a scan tool.
Turn ON the ignition, with the engine OFF.With the scan tool, establish communications with the electronic brake control module (EBCM). Select Special Functions. Select Automated Bleed from the Special Functions menu.
Bleed the base brake system.Follow the scan tool directions until the desired brake pedal height is achieved.
If the bleed procedure is aborted, a malfunction exists. Perform the following steps before resuming the bleed procedure:
If a DTC is detected, check for the cause and repair as necessary.
If the brake pedal feels spongy, perform the conventional brake bleed procedure again.
When the desired pedal height is achieved, press the brake pedal in order to inspect for firmness.Remove the scan tool.
Install the tire and wheel assemblies.Inspect the brake fluid level.
Road test the vehicle while inspecting that the pedal remains high and firm.
Raise the vehicle on a suitable support.
Remove all four tire and wheel assemblies.
Inspect the brake system for leaks and visual damage.
Inspect the battery state of charge.
Install a scan tool.
Turn ON the ignition, with the engine OFF.
With the scan tool, establish communications with the electronic brake control module (EBCM). Select Special Functions. Select Automated Bleed from the Special Functions menu.
Bleed the base brake system.
Follow the scan tool directions until the desired brake pedal height is achieved.
There are two methods of adjusting the brakes on your vehicle.
Start by pressing in the button on the hand (parking) brake lever and keeping it depressed while you pull it to the extreme of its travel
Have a friend listen to both rear wheels for a clicking sound (which indicates that the automatic adjusters are working)
Keep up this method until the lever begins operating at a lower position and gives just six clicks to activate.
If the foot pedal still seems low, We then have to go to the other method.
Take two chassis stands, or wooden blocks, but NOT concrete blocks as these may crush under the weight of the vehicle
Chock the front wheels at the back and front of each, so the vehicle is secure.
Next loosen the rear wheel nuts (lugs)
Jack up the rear of the vehicle and remove the nuts and wheels.
Look carefully at the brake drum and you will see two tapped holes which will accept twelve mm bolts (head or spanner size) The bolts should have at least three inches of thread.
Release the hand brake.
Insert the two bolts and tighten them at the same time, so that the drum is removed evenly.
Inspect the brake linings to make sure they don't require replacement.
Inspect the inside of the drums to make sure that they are free from ridges.
If they have ridges they should first be skimmed before using....and keep in mind that there is a minimum thickness that if exceeded means replacement of the drums.
At the upper part of the assembly you will see an assembly rod with a wheel in the middle and locked in place by a lever which rests against it....
Pull the lever away from the wheel and using a screw driver, turn the wheel so that the rod expands, becoming longer count each click of adjustment.
The adjusting wheel should only be moved the equivalent of one tooth at a time.
Adjust until the drum fits back and can revolve but a tiny swishing sound can be heard when rotating.
Carry out the same adjustment on the opposite side and reassemble.
Check the hand brake for correct movement.(six clicks to engagement)
Pump the brake pedal once or twice and the keeping your foot depressed on the pedal, start the engine.
The pedal should move lower as the servo becomes operational. (that's an additional test on a different part of the braking system) which I thought you like to know....If the pedal remains without moving, there is a defect in the servo unit.
Remove the dust cap from the rear hub and bearing assembly.
Remove the cotter pin, nut retainer and wave washer. Discard the old cotter pin.
Remove the rear hub and bearing assembly retainer nut and washer. Remove the rear hub and bearing assembly from the spindle.
Remove the automatic adjuster spring from the adjuster lever.
Rotate the automatic adjuster starwheel enough so both shoes move out far enough to be free of the wheel cylinder boots.
Disconnect the parking brake cable from the actuating lever. Disconnect parking brake cable one side at a time.
Remove the both lower brake shoe to anchor springs.
Remove the 2 brake shoe hold-down springs from the brake shoes.
Remove the brake shoes, upper shoe-to-shoe return spring, automatic adjuster and automatic adjuster lever from the backing plate as an assembly.
Separate the brake shoes from the automatic adjuster mechanism.
Remove the brake shoe automatic adjuster lever from the leading brake shoe.
Thoroughly clean and dry the backing plate. To prepare the backing plate, lubricate the bosses, anchor pin and parking brake actuating lever pivot surface lightly with lithium based grease.
Remove, clean and dry all parts still on the old shoes. Lubricate the starwheel shaft threads with anti-seize lubricant.
Assemble both brake shoes, the top shoe to shoe return spring, automatic adjuster and automatic adjuster lever before mounting on vehicle. Make sure the ends of the automatic adjusters are positioned above the extruded pins in the webbing of the brake shoes prior to installation.
Install the brake shoe assembly onto the brake support plate and install the hold-down springs.
Install the lower anchor springs and reconnect the parking brake cable to the park brake lever of the trailing brake shoe.
Rotate the serrated adjuster nut to remove the free-play from the adjuster assembly.
Install the automatic adjuster lever spring on the lead brake shoe assembly and the automatic adjuster lever.
Install the rear hub and bearing assembly. Install washer and retainer nut and torque to 124 ft. lbs. (168 Nm).
Install the wave washer, nut retainer and a new cotter pin onto the spindle. Install dust cap.
Adjust brake shoes so not to interfere with brake drum installation. Install the rear brake drum.
NOTE: After installing the brake drums, pump the brake pedal several times to partially adjust the brake shoes. To verify proper operation of the self-adjusting parking brake, be sure that both rear brakes are not dragging when the parking brake pedal is released.
Install the rear wheels and lug nuts. Torque the lug nuts, in a star pattern sequence, to 95 ft. lbs. (129 Nm).
Road test the vehicle. The automatic adjusters will continue brake adjustment during the road test of the vehicle.
The emissions test may vary from one state to the next. For example in NY the 1990 model would not have to have an emissions test, which for newer vehicles is part of the Inspection.
The safety inspection includes:
front and rear brakes
parking brake for a manual tranny All lights on vehicle, turn signals, brake lights
Horn needs to work
Wipers need to work
Tires need to have adequate tread
Any cracks in glass (windshield) need to be within safety limits
on older vehicles, mechanic may also look at steering linkage, brake lines for severe corrosion.
And basically any malfunction or damage to the vehicle that would place it in an unsafe condition. That could anything from a bumper that's ready to fall off to a gas leak at the gas tank.
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.
Hi... to adjust rear brakes providing the shoes are good... just drive vehicle in reverse and pump brakes... rear shoes are self adjusting so they should "adjust" themselves... after doing this test by putting on park brake, put vehicle in drive and see if vehicle moves forward, repeat procedure if necessary. Hope this helps... please rate suggestion.... ty