Front brake rotor removing and installing

^ Use a micrometer to measure rotor thickness at eight to ten positions on rotor braking surface. Rotor runout should be measured using a dial indicator setup.

If a low speed shimmy goes away when the brakes are released, excessive rotor runout is probably the cause of the shimmy. If the rotor's runout is within limits, and the shimmy still persists, check the front wheel bearings as described in 401 Front Suspension.

Brake rotors can be resurfaced by most local automotive machine shops.

Always replace or machine brake rotors in pairs.

— Press brake pedal down about 1 in. and hold in place with a pedal stop.

This will prevent brake fluid from dripping out of open brake lines while the work is being performed.

— Raise car and remove front wheels.

Make sure the car is firmly supported on jack stands designed for the purpose. Place the jack stands beneath a structural chassis point. Do not place jack stands under suspension parts.

^ Working in wheel housing, disconnect electrical connector (A) for brake pad wear sensor and remove harness from clip on strut body.

— Disconnect rubber brake hose (B) from metal brake line near bottom of strut. Plug hydraulic lines.

When working with hydraulic brake lines and hoses be sure to counterhold fitting before loosening or tightening.

944 Front Brake Wires

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— Remove caliper mounting bolts and remove caliper. See 470 Brakes-Hydraulic.

— Remove wheel bearing dust cover.

Loosen 6 mm alien clamping screw in wheel bearing lock nut and unscrew and remove lock nut from spindle.

— Pull brake rotor with bearing hub and wheel bearings straight off steering spindle.

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1975 Porsche 911 Front Disk

^ Remove 8 mm bolts (arrows) mounting brake rotor to hub. • Tap hub out of rotor with a soft hammer.

1984 Porsche Wiring

Clean rotor mounting surface on hub with a wire brush. — Install new rotor on hub and torque bolts.

Tightening Torque

• Brake rotor to bearing hub (M8) 23 Nm (17 ft-lb)

— Reinstall hub and rotor on spindle and install outer wheel bearing.

• Adjust wheel bearing as described in 401 Front Suspension

• Install bearing dust cap.

Remove Rear Hub Porsche 964

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Tightening Torque

• Wheel bearing lock nut clamp screw (M8) 15 Nm (11 ft-lb))

— Remainder of assembly is reverse of disassembly.

• Bleed brakes as described in 470 Brakes-Hydraulic.

Tightening Torques

• Brake caliper bleeder screw

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