944 S2 Cabriolet L4-2990cc 3.0L DOHC (1991)
Brake Rotor/Disc: Customer Interest
Brakes - Pedal Pulsation/Vibration
March 10, 1992
Model
All
Part Identifier
4064/68
4650/53
Group
4
Number
9203
Subject:
Brake Disc and Wheel Hub Run-Out
ATTENTION:
Service Manager/Service Technician
Models Affected:
All
Concern:
Brake pedal pulsation/vibration. Checking brake disc and wheel hub run-out
Repair Information:
When repairing brake pedal pulsation or vibration, the brake disc and wheel hub lateral run-out must be
measured.
Work Procedure:
1.
Check, and if necessary, adjust wheel bearing play.
2.
Remove wheel and install adaptor plate tool number 9510 or steel spacers. Torque wheel lug nuts to 130
N-m (96 ft.lbs.).
3.
Install dial gauge with suitable gauge holder. Use a dial gauge pin with a large base. Place gauge pin on
largest diameter of brake surface. Set gauge with approximately 2 mm pre-load, rotate disc and record
run-out Maximum assembled permissible run-out: 0.10 mm.
If disc run-out is more than 0.10 mm, remove disc and measure runout on inside and outside brake disc
surface, on a brake lathe. Maximum permissible run-out with disc removed: 0.05 mm.
Measure also wheel hub lateral run-out. Install dial gauge with suitable gauge holder. Place gauge pin on
largest diameter of wheel hub. Set gauge with approximately 2 mm pre-load. Rotate wheel hub and record
run-out. Maximum permissible run-out: 0.05 mm.
4.
If necessary, machine brake disc and/or replace wheel hub. Refer to specifications and wear limits
published in the Workshop Manuals (Repair Group 46).