Wheel Removal Installation Brake Inspection R Bortignon 1
Wheel Removal & Installation Brake Inspection R. Bortignon 1
Wheel Removal… Lift up the vehicle & keep in mind… Ø Ø Unibody or body on frame? FWD or RWD? Convertible? Rust? If you are using a tire iron, then loosen (1/2 turn) each wheel nut before you jack up the car • 2
Using an Impact Gun Be sure to use the black impact sockets only! Metric or Imperial? ? ? All imports = metric North American cars built after early to mid 1980’s = metric North American cars built before mid 1980’s = Imperial 3
Important Considerations… 4
Checking the Brakes • there are two styles of brake mechanisms… Disc: on the front wheels Drum: on the rear wheels of some vehicles many late model vehicles use disc brakes on all 4 wheels ü many cars built before the early 1970’s used drum brakes on all 4 wheels ü 5
Brake Terminology Disc brakes use brake pads Drum brakes use brake shoes The terms pads and shoes are not interchangeable! 6
Disc Brake Pad Wear new brake pads on most vehicles are about 10 mm thick • be sure to check the inner and outer brake pads Ø brake pads should be replaced when they are below 2. 0 mm or 0. 060” in thickness • 7
Disc Brake Inspection Continued… DO NOT create dust by using air tools! Visually check these items… Brake disc/rotor for grooves 2. Brake flex hose for cracks or swelling 3. Brake caliper: dampness = brake fluid leak 1. 2 3 1 8
Drum Brake Inspection wear a dust mask! • to inspect drum brakes, first remove the drum by pulling it off (split drum type) Ø • for one piece drums, refer to next slide • inspect brake shoe thickness • new: ≈6 mm thick • replace: 1. 5 mm or 0. 060” thick • wheel cylinder leaks? • grooves in brake drum use the Clayton brake washer if you are on the hoist, otherwise use a hose or spray bottle to wash off brake dust! Ø 9
One piece drum removal 1) remove bearing dust cap 2) remove cotter pin or unlock staked nut using a narrow chisel 3) remove the bearing adjusting nut, washer & outer bearing Ø keep the bearing clean! 10
Before After 11
While you are under there…FWD Axle Inspection inspect front axles on FWD vehicles… check axle boots on the constant velocity joints (CV) • 12
Reinstalling Wheels 1. Place the wheel back on the car. 2. Install the wheel nuts tapered side in!!! 13
3. Tighten the nuts by hand (use a socket). 4. Lower the vehicle. 5. Use a torque wrench to tighten wheels Ø Refer to Mitchell to find the wheel torque specs in the maintenance section. (Most vehicles: 80 to 100 Ft. Lbs. ) 14
- Slides: 14