Brakes - Pulsation During Moderate Brake Application

REFERENCE BRAKES
NUMBER 003
DATE 3-21-86
MODEL SV, CV
To reduce brake pedal pulsation during moderate brake application, anti-squeal springs have been reinstalled on all Camrys as of December, 1985.

PRODUCTION EFFECTIVE:

FROM VIN PRODUCTION DATE

JT2SV1##*G0417970 December, 1985
JT2SV1##*G6008334 December, 1985
JT2CV1##*G0003925 December, 1985

Section I. Installation Procedure for brake pad anti-squeal springs produced prior to December, 1985 differ by vehicle production date:

FROM TO PROCEDURE

January, 1984 July, 1985 A
August, 1985 October, 1985 B
November, 1985 Present A

BRAKE ASSEMBLY:

Procedure A: Requires replacement of the following:

- Brake pad kit, P/N 04491-32100 (includes anti-squeal springs)
(Illus. 1).

NOTE: When replacing brake pads, rotor runout must be within the following spec: 0.004 in (0.1 mm). See rotor/hub runout procedure section II of this bulletin.
Procedure B: Requires replacement of the following:

- Brake Pad Kit, P/N 04491-32100 (includes anti-squeal springs)
- Caliper (left), P/N 47750-32041
- Caliper (right), P/N 47730-32041

Replacement of the front brake calipers are necessary to provide adequate clearance for the installation of the anti-squeal springs.

NOTE: When replacing brake pads, rotor runout must be checked and be within the following spec. 0.004 in (0.1 mm). See rotor/hub runout procedure section II of this bulletin.


Section II. The following procedures are necessary to obtain rotor/hub runout of less than 0.004 in (0.1 mm).

Rotor Runout Measurement:

Step 1 Rotor runout should be checked with a dial indicator gauge by securely
attaching the base of the dial indicator to the front strut tower. See Illustration 2.
Step 2 Measure runout at the outer edge of the rotor disc, rotating the rotor
disc and observing the runout of the dial indicator gauge. If runout is less than 0.004 in. (0.1 mm) install new brake pads P/N 04491-32100 with anti-squeal springs. If runout is greater than 0.004 in. (0.1 mm) but less than .0059 in. (0.15 mm) resurface rotor. Minimum rotor thickness is 0.827 in. (21 mm), standard rotor thickness is 0.866 in. (22 mm). If rotor runout is greater than 0.0059 in. (1.5 mm) replace rotor. See step 3.

Front Hub Runout Measurement:

Step 3 Measure front hub runout at the most inward position with a dial indicator
gauge. See Illustration 3. Scribe a Phase-match mark on the hub at the lowest point.
Step 4 When installing new rotors or resurfaced rotors on the vehicle the
rotors must be phased matched to the hub. All replacement rotors P/N 43512-32110 have a phase match mark (oil paint) on the high side of the rotor.

NOTE:
Care should be taken when removing the protective rust material from the rotors since the mark is an oil paint and will also be removed. Scribe the rotor on the outer edge and not the rotor surface as this may also cause a brake pedal pulsation.

Step 5 On new rotors, align the phase match mark to the phase match mark on
the hub. Rotor runout should be less than 0.004 in. (0.1 mm) if runout is greater than 0.004 in. (0.1 mm) reposition the rotor on the hub and recheck runout. If runout still exceeds specs replace the hub.

Step 6 On the resurfaced rotor install the rotor to the hub and check rotor
runout. Rotor runout should be less than 0.004 in. (0.1 mm). If runout exceeds 0.004 in. (0.1 mm) replace the hub.