What causes rear wheel lockup on Phoenix brakes?
What causes rear wheel lockup on Phoenix brakes?
The shoe lands or “bosses” are an often overlooked item when looking for the cause of a rear wheel lockup condition. The shoe lands keep the brake shoes square with the drum and provide a friction surface for the shoes to move against. Over time the bosses can become grooved and corroded as in Figure 61.6.
Can a out of round brake drum cause one wheel lockup?
An out of round brake drum or drums that vary in diameter too much from side to side could cause a one wheel lockup condition (Figure 61.8). Measuring drum runout or out of roundness is not easy in the field. Current micrometers do not allow a repeatable measurement to be taken.
What does it mean when your brakes lock up?
The brakes locked up, and I went to the Master Cylinder and loosened the brake line that was closer to the front of the truck (which I believe is the rear brakes). I loosened it enough for fluid to come out, and then all of a sudden the wheels broke free and the truck “rocked” into park.
Why are the brakes on my GMC Sierra not working?
I have an 01 GMC Sierra 2500 (non HD) with 232,000 miles. I’ve been having problems with the brakes lately. Recently, the brakes would not release after you let off the pedal, and continually got worse until you could not physically move the truck.
The shoe lands or “bosses” are an often overlooked item when looking for the cause of a rear wheel lockup condition. The shoe lands keep the brake shoes square with the drum and provide a friction surface for the shoes to move against. Over time the bosses can become grooved and corroded as in Figure 61.6.
What happens when one brake is stuck on a Chevy Silverado?
Pulling to one side – When one brake is stuck (particularly a front brake) the whole vehicle will pull in the direction of the bad brake. So if it is on the passenger side, your Silverado will feel like it is steering in that direction.
An out of round brake drum or drums that vary in diameter too much from side to side could cause a one wheel lockup condition (Figure 61.8). Measuring drum runout or out of roundness is not easy in the field. Current micrometers do not allow a repeatable measurement to be taken.
What to do if your rear brakes keep locking up?
If you take the rear drums off put just a dab of grease on all the metal to metal contact areas for smooth operation, just a dab. You might also try flushing the brake system since the fluid may have crap in it that could be causing issues. I’m pretty sure it’s just the passenger side.
What causes the brakes on a Chevy Silverado to stick?
The brake hose that attaches to the Silverado’s caliper will often cause the brakes to stick. They may appear to be fine on the outside, but can break apart and collect debris on the inside. When this happens, it effectively traps pressure in the line. This keeps the brakes from releasing all of the way, and they stick as a result.
What causes rear drum brakes to engage too soon?
If the parking brake system is not de-adjusted properly before the brake shoes are adjusted it will cause the rear brakes to engage too soon. This is especially true of vehicles equipped with duo-servo rear drum brakes (see Figure 61.1).
Why does my car squat when I put the brakes on?
They are also very sensitive to the type of friction that is used. If the friction has too high a coefficient of friction it could cause the rear end of the vehicle to “squat” when the rear brakes are applied or it could cause rear wheel lockup.
Where are the hard brake lines on a 95 Chevy?
On my 95 chevy, there is 1 small and 1 large hard brake line connected to the master cyliner, the smaller of the 2 is mounted near the firewall. Both lines run to the ABS sensor/pump whatever box.
Is it safe to drive a GM truck with ABS?
The front speed sensors are 100% clean as possible, the rear brakes are adjusted. I just really hate the way this truck stops, its not firm and not safe in a lot of fast traffic. In most any GM truck ive driven with ABS there is a split second when you hit the brakes hard before they engage right, it just doesnt feel right.
The brake hose that attaches to the Silverado’s caliper will often cause the brakes to stick. They may appear to be fine on the outside, but can break apart and collect debris on the inside. When this happens, it effectively traps pressure in the line. This keeps the brakes from releasing all of the way, and they stick as a result.
Why are the hold down Springs on my rear brake so weak?
Hold down springs are designed to keep the brake shoe firmly against the backing plate. If the hold down springs are weak then the shoe could cock causing a binding condition. The replacement of rear shoe hardware should be suggested each time the rear brake shoes are replaced to prevent this from happening.
How often should rear brake shoes be replaced?
The replacement of rear shoe hardware should be suggested each time the rear brake shoes are replaced to prevent this from happening. The shoe lands or “bosses” are an often overlooked item when looking for the cause of a rear wheel lockup condition.
Is the brake wheel cylinder designed to wear out?
The brake wheel cylinder is the primary part that helps the brake shoes apply pressure to the inside of the drum, thereby slowing the vehicle down. Unlike brake shoes or pads or the brake drum itself, the brake wheel cylinder is not designed to wear out. In fact, it’s very rare that this component breaks or fails at all.
What does it mean when your brake wheel is leaking?
Since the system works harmoniously together, the lack of dual pressure can cause sounds similar to grinding or worn out brake shoes. Brake fluid is leaking from the wheel cylinders: A quick inspection of the rear wheels and behind the brake drum typically shows that brake fluid is leaking if the brake wheel cylinder has broken internally.
How can I tell if my brake cylinder is corrosion resistant?
Verify that the bleeder screws inside the wheel cylinder are corrosion resistant. Match the metal from OEM: Wheel cylinders are made from metal, but often different types of metal. If you have a steel OEM wheel cylinder, make sure your aftermarket part is also steel.
