Special Service Message
NOTE: A Special Service Message is a formal communication issued by Land Rover and carries
the same importance of a Technical Service Bulletin. An SSM is a quick method of
communicating "Need To Know" information to the technical service community. SSM's may
be issued in advance of a technical bulletin or may be the only communication on a given
topic. All information contained in Land Rover technical communications are intended for
use by trained, professional technicians with the knowledge, tools, and equipment required
to complete the procedure correctly and safely. It informs the Technicians of conditions that
may occur on some vehicles, or provides information that could assist in correct vehicle and
diagnostic service.

SSM 75447 - 21MY - Brake noise and Judder felt through the floor
during braking
Models : Defender/L663
Range Rover / L405
Range Rover Sport /
L494
Range Rover Velar /
L560
Engineer Hooper Tristan
Name :
Last 29 JUN 2021 15:33:59
Modified :
Category : Chassis
Symptom : 301000 Service Brake System
Content : Issue:
Cyclic knocking noise felt through the floor during
braking actions
Cause:
Under investigation, localised brake pad transfer layer
onto the front brake discs combined with disc surface
roughness variability
Actions:
If the symptom is identified carry out the following:
Check and rectify any DTCs related to the ABS
(Anti-lock Braking) system
Lift Vehicle (Topix JACKING AND LIFTING 100-02)
Remove front and rear road Wheels to gain access
to Brake Disc (Topix REMOVAL AND
INSTALLATION - 204-04)
Clean the front and rear discs thoroughly with JLR
approved Brake cleaning fluid and an appropriate
scouring pad such as ‘3M Scotch-Brite’, take care
to remove all traces of pad material.
Using 150 grit Emery Cloth or similar designed

paper for metal sanding with a block to apply 4-5
radial strokes across the braking surfaces (refer to
attached photographs for before and after
conditions). Access to the inside and outside
surface is possible without further disassembly.
When the entire disc surface has been prepared
(inside and out), reassemble the road wheels.
Carry out a further road test to validate the fix,
during the test carry out a 5 - 8 moderate braking
decelerations (approximately 3-5 seconds) from
30 mph (50kph) down to 5 mph (8kph).
Important Notes:
Do not try to diagnose the issue by running the
vehicle with the wheels off the ground as this is
may cause damage and false DTC’s.
Please avoid severe or heavy braking at any speed
during this road test unless traffic conditions
require it.
During the test ensure adherence to local market
speed regulations at all times.
If this does not resolve the issue, please submit an
EPQR including photographs of the discs and pads
after the road tests and hold any exchanged parts for
priority return to JLR.
Thank you in advance for your assistance with this
matter.

File : 1Disc after sanding example.JPG
1Frt disc before sanding.jpg
1Frt disc before sanding 2.jpg
Jaguar Land Rover Limited 2000 - 2020 (Rel. 2691)