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 74874 - New Defender L663: Brake noise (363mm 14.29` Discs) felt
through the floor during braking
Models : Defender/L663
Engineer Diegnan Paul
Name :
Last 27 JUL 2020 06:51:46
Modified :
Category : Chassis
Symptom : 301000 Service Brake System
Content : Issue:
Cyclic knocking noise felt at the front of the vehicle
through the floor during braking actions on 363 mm
(14.29 in) Disc versions only.
Vin range SALE97EU6L2000584 to SALE97EU6L2017323
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:
1 . Check and rectify any DTCs related to the ABS
(Anti-lock Braking) system
2 . Lift Vehicle (Topix JACKING AND LIFTING 100-02)
3 . Remove front and rear road Wheels to gain access
to Brake Disc (Topix REMOVAL AND
INSTALLATION - 204-04)
4 . 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.
5 . 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.
6 . When the entire disc surface has been prepared
(inside and out), reassemble the road wheels.

7 . Carry out a further road test to validate the fix,
during the test carry out a 5 - 8 moderate braking
decelerations (approximatley 3-5 seconds) from
30 mph (50kph) down to 5 mph (8kph).
I m p o r t a n t N o t e s:
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.

File : Frt disc before sanding.jpg
Disc after sanding example.JPG
Frt disc before sanding 2.jpg
Jaguar Land Rover Limited 2000 - 2020 (Rel. 2682)