What does rear brake imbalance mean?
What is a brake imbalance? When you are braking, each brake should apply the same amount of force. This allows your car to brake smoothly without pulling to one side. A brake imbalance occurs when the amount of force produced by each brake is uneven.
How do you calculate brake imbalance?
Calculate the vehicle’s weight. The weight of the vehicle can be found in the vehicle’s manual. Divide the vehicle’s weight by the total brake effort, and then multiply the number by 100 to get the brake efficiency percentage. Weigh everything inside your car as well, because that will affect the brakes.
Can brake Drums be out of balance?
Yes they can. I’ve seen one brand new out of the box drum so out of balance that it had to be junked.
What causes uneven wear on brakes?
In some cases, brake rotors can wear unevenly, causing what’s known as Disc Thickness Variation (DTV). DTV can be caused by different factors, such as sticking calipers, rust, slamming on the brakes frequently, or dirt and debris getting stuck between the pad and the rotor.
Is handbrake checked on MOT?
Parking brake (‘handbrake’) The parking brake lever’s mountings will be checked for security and/or corrosion. On electronic systems a parking brake warning light illuminated is a failure.
How do you check brake drum runout?
Position the dial indicator tip against the brake drum shoe surface. Rotate the brake drum to the lowest reading. Zero the dial indicator. Rotate the brake drum one complete revolution and observe total indicated runout.
Can rear brake drums cause vibration?
If the brake drums are worn excessively they can cause vibrations that may be felt in the pedal. Worn drums may also cause shuddering or pulsating that will become noticeable once you step on the pedal.
What happens when rear brakes fail?
If you let the brakes go too long without repair, you can cause extensve damage. Brakes that are worn down too low may also not be able to stop your vehicle, resulting in injury to you or someone else.
What makes a car fail the roller brake test?
An imbalance of over 30% will lead to a fail on the test unless it passes on locks. It is recommended that any imbalances over 10% are investigated and brakes adjusted to address the imbalance. Ensure your maintenance provider knows how to read the roller brake test correctly.
What happens if you fail a brake imbalance Mot?
Failed mot on rear brake imbalance, difference was ove 40 percent (max allowed is 30 percent). Car had been sitting a while, figured sticking calliper or slider pin problem. Rubbed down the slider pins,regreased, replaced caliper with a new one, bled the brakes. Retest tonight, fail again, this time difference is 37 percent.
Is there a brake imbalance in a corolla JAP?
My wife’s Toyota Carib ( a 4WD 1.8 Corolla Jap Import) failed its WOF (like the MOT) the other day, due to brake imbalance. The deal is is that the rear RH brake is 36% down on the rear LH brake. I had a mechanic take the drums off and clean the brakes, but on re-testing the RH brake was still 33% down.
Can a handbrake be used on an imbalanced rear brake?
Hence the imbalance and MoT failure. Handbrake application yielded a similar result. So – off with the (old) drums, sanded them, sanded the (brand new) shoes, swapped the drums from one side to the other, re-adjusted the shoes and back down to the test station. Same result – almost exactly the same, actually (i.e. LHS strong, RHS weaker).