Brakes - Resonance/Vibration

S60/V70 (01-)/V70XC (01-) 2001-
S80 1999-

Section
5

Group
51

No.
0007

Year
03

Month
11

Brake vibrations, analysis and corrective action

Background:

This Service Bulletin describes diagnosis and the repair process in the event of vibrations and resonance noise when braking. It is primarily intended to make it easy to identify whether the vibrations are coming from the front or rear wheels.

Material

Description P/N
Screw 95 5349

Special tools

Description P/N
Measuring tool kit 9995418
Holder dial test indicator 999 5773

Vibration symptoms that may be apparent when braking

Speed at which the symptom Front brakes Rear brakes
is most evident MPH (km/h)

55-70 (90-110) Steering wheel Vibrations in the bodywork
vibrations Humming

5-25 (10-40) Humming/vibrations (54 Hz)
from the rear axle

Variation in the thickness of the front brake discs may sometimes be experienced as a pulsing brake pedal or variable deceleration during normal braking, just before coming to a standstill.

Conditions:

Customer complaints about constant vehicle vibrations and humming when braking from the brakes and not from ABS modulation.

Brakes
Checking and adjusting brake vibrations





Installing the special tool on the front brake discs 1

Remove the lower screw from the brake caliper bracket.
Install measuring tool 999 5418 and holder 999 5773 (1) as illustrated. Use screw P/N 95 5349 and a spacer sleeve (2).
Adjust holder 999 5773 50 that it does not lie against the shield or brake caliper.

Note!
Make sure the measuring tips are tight.

2





Dimension (A)=20 mm in on the brake disc.

Caution!
Turn the brake disc downward at the front edge (counter clockwise for the left-hand side and clockwise for the right-hand side) so that any play in the holder 999 5773 does not affect the measurement result.

A protective glove should be worn to protect your fingers.





Maximum permitted variation in thickness (DTV);

Measuring the front brake discs 3

Take measurements on one of the front sides. If the variation in thickness is greater than the given maximum value, select option A1.
If the variation in thickness is less than the given maximum value, take measurements from the other front side.
If the variation in thickness is greater than the given maximum value, select option A1.
If the variation in thickness is less than the given maximum value, select option A3.

A1 Replacing of both front brake discs 4

Replace both front brake discs. See VADIS;
Repairing and installing
Function group 51
Replacing front brake discs.
Continue with option A2.

A2 Measuring the rear brake discs 5

Install measuring tool 999 5418. See VADIS;
Cleaning, checking and adjusting
Function group 51
Measuring the permitted variation in thickness on the rear brake discs.
Install holder 999 5773.
Take measurements from one of the rear sides. If the variation in thickness is greater than the given maximum value, select option A3.
If the variation in thickness is less than the given maximum value, take measurements from the other rear side.
If the variation in thickness is greater than the given maximum value, select option A3.
If the variation in thickness is less than the given maximum value; The repair is complete.

A3 Replacing of both rear brake discs 6

Replace both front brake discs. See VADIS;
Repairing and installing
Function group 51
Replacing rear brake discs.





WARRANTY STATEMENT:
Claims may be submitted under the New Car Warranty when there is a documented customer complaint, using claim type 01.