What are primary and secondary brakes?
What are primary and secondary brakes?
A secondary brake system is normally located in the front axle and is actuated by a hand lever. A primary brake valve controls communication of fluid pressure to the primary brake piston. A secondary brake valve controls communication of fluid pressure to the secondary brake piston.
How do you set a parking brake unit?
To set this unit, the parking brake lever must be actuated to its stop. Then, exert pressure with a screwdriver on the unit and release the hand brake lever while keeping the adjustment spring stop pressed back. Continue releasing the lever and maintain the pressure until the retention hook engages in the stop.
How do you tighten the parking brake on a BMW?
After carrying out the adjustment on both wheels, tighten the wheel bolts to the indicated torque (120 N). Once the wheel nuts are tightened, the adjustment unit must be unlocked. To do this, move the retaining hook outward using the screwdriver as a lever.
What should the torque setting be on the parking brake?
A basic setting of less than 8 slots could cause damage to the shoes, as they would be in permanent contact with the disc. After carrying out the adjustment on both wheels, tighten the wheel bolts to the indicated torque (120 N). Once the wheel nuts are tightened, the adjustment unit must be unlocked.
What’s the correct way to adjust a brake?
Most manual slack adjusters have a spring–loaded locking sleeve that must be pressed in and held so the adjusting bolt can be turned. Depending upon the orientation of the slack adjuster, the correct direction to turn the adjusting bolt may be clockwise or counterclockwise.
What’s the best way to adjust a parking brake?
Step 2: Turn the self-adjuster counterclockwise. Most of the time – but not always – you will want to turn the nut counterclockwise to provide slack in the cable system. You do not want the cables to become slack and loose. You only need enough slack in the cable system so that they are not pulling on the rear shoe parking brake adjuster.
What happens if you dont adjust your parking brake shoe?
The only part of this procedure that applies to disc-only systems is the adjustment of the cable system. Warning: Improperly adjusted parking brakes can lead to premature shoe failure, drum or rotor warping, and the distinct possibility of a fire at the rear wheels. The vehicle may also cease moving forward.
Where is the parking brake cable adjuster located?
Note: Refer to your owner’s manual if you are not certain about jack stand placement. Step 1: Locate the brake cable adjuster. The brake cable adjuster is usually located in one of two different places: either under the car about midway between the front and the rear, or attached to the parking brake lever.
Can a four wheel disc brake be adjusted?
Some vehicle with four-wheel disc brakes still use a drum brake inside the rear rotors that acts as the parking brake. These drum brake systems need adjustment, too, and in fact a parking brake that is too far out of adjustment can fail a state vehicle inspection. Adjusting drum brakes correctly can be an art. Making the adjustments is pretty easy.
