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Wheel Removal & InstallationWheel Removal & Installation

Brake InspectionBrake Inspection

R. BortignonR. Bortignon

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Wheel Removal…Wheel Removal… Lift up the vehicle & keep in mind…Lift up the vehicle & keep in mind…

Unibody or body on frame?Unibody or body on frame? FWD or RWD?FWD or RWD? Convertible?Convertible? Rust?Rust?

• If you are using a tire iron, thenIf you are using a tire iron, then loosen (1/2 turn)loosen (1/2 turn) each wheel each wheel nut nut before before you jack up the caryou jack up the car

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Using an Impact GunUsing an Impact Gun

Be sure to use the black impact sockets only!Be sure to use the black impact sockets only!

MetricMetric oror ImperialImperial??????

All imports =All imports = metricmetric

North American cars built North American cars built after early to mid 1980’safter early to mid 1980’s = = metricmetric

North American cars built North American cars built before mid 1980’sbefore mid 1980’s = = Imperial Imperial

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Important Considerations…Important Considerations…

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Checking the BrakesChecking the Brakes

• there are two styles of brake mechanisms…there are two styles of brake mechanisms…

Disc: on the front wheelsDisc: on the front wheels

Drum: on the rear wheels of some vehiclesDrum: on the rear wheels of some vehicles

many late model vehicles use disc brakes on many late model vehicles use disc brakes on all 4 wheelsall 4 wheels

many cars built before the early 1970’s used many cars built before the early 1970’s used drum brakes on all 4 wheelsdrum brakes on all 4 wheels

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Brake TerminologyBrake Terminology

Disc brakes use brakeDisc brakes use brake padspads

Drum brakes use brakeDrum brakes use brake shoesshoes

The terms pads and shoes are The terms pads and shoes are notnot interchangeable! interchangeable!

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Disc Brake Pad WearDisc Brake Pad Wear

• new brake pads on most new brake pads on most vehicles are about 10mm thickvehicles are about 10mm thick

be sure to check the inner and be sure to check the inner and outer brake padsouter brake pads

• brake pads should be replaced brake pads should be replaced when they are below 2.0mm or when they are below 2.0mm or 0.060” in thickness0.060” in thickness

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Disc Brake Inspection Continued…Disc Brake Inspection Continued…

DO NOT create dust by using air tools!DO NOT create dust by using air tools!

Visually check these items…Visually check these items…

1.1. Brake disc/rotor for groovesBrake disc/rotor for grooves 2. Brake flex hose for cracks or swelling2. Brake flex hose for cracks or swelling3. Brake caliper: dampness = brake fluid leak3. Brake caliper: dampness = brake fluid leak

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Drum Brake InspectionDrum Brake Inspection wear a dust mask! wear a dust mask! • to inspect drum brakes, first remove the to inspect drum brakes, first remove the drum by pulling it off (split drum type)drum by pulling it off (split drum type)

• for one piece drums, refer to next slidefor one piece drums, refer to next slide

• inspect brake shoe thicknessinspect brake shoe thickness• new: ≈6mm thicknew: ≈6mm thick• replace: 1.5mm or 0.060” thickreplace: 1.5mm or 0.060” thick

• wheel cylinder leaks?wheel cylinder leaks?

• grooves in brake drumgrooves in brake drum

use the Clayton brake washer if you are on the use the Clayton brake washer if you are on the hoist, otherwise use a hose or spray bottle to hoist, otherwise use a hose or spray bottle to wash off brake dust! wash off brake dust!

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One piece drum removalOne piece drum removal

1) remove bearing dust cap1) remove bearing dust cap

2) remove cotter pin or unlock staked nut using 2) remove cotter pin or unlock staked nut using a narrow chisela narrow chisel

3) remove the bearing adjusting nut, washer & 3) remove the bearing adjusting nut, washer & outer bearingouter bearing

keep the bearing clean!keep the bearing clean!

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Before AfterBefore After

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While you are under there…FWD Axle InspectionWhile you are under there…FWD Axle Inspection

inspect front axles on FWD inspect front axles on FWD vehicles…vehicles…

• check axle boots on the check axle boots on the constant velocity joints (CV)constant velocity joints (CV)

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Reinstalling WheelsReinstalling Wheels

1. Place the wheel back on the car.1. Place the wheel back on the car.

2. Install the wheel nuts2. Install the wheel nuts tapered side intapered side in!!!!!!

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3. Tighten the nuts by hand (use a socket).3. Tighten the nuts by hand (use a socket).

4. Lower the vehicle.4. Lower the vehicle.

5. Use a torque wrench to tighten wheels5. Use a torque wrench to tighten wheels Refer to Mitchell to find the wheel torque specs in the Refer to Mitchell to find the wheel torque specs in the

maintenance section. (Most vehicles: 80 to 100 Ft. Lbs.)maintenance section. (Most vehicles: 80 to 100 Ft. Lbs.)