Ford Falcon. Manual — part 63
206-03-1
Front Disk Brake
206-03-1
SECTION : 206-03 Front Disk Brake
VEHICLE APPLICATION : 2003.0 BA Falcon
CONTENTS
PAGE
SPECIFICATIONS
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .206-03-2
DESCRIPTION AND OPERATION
Front Disc Brake . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 206-03-3
Disc Pad Running Clearance . . . . . . . . . . . . . . . . . . . . . . . ...206-03-4
Wear
Adjustment
. . . . . . . . . . . . . . . . . . . . . . . . . . . . ..206-03-4
Rotor
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 206-03-4
DIAGNOSIS AND TESTING
Front Disc Brake . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 206-03-5
REMOVAL AND INSTALLATION
Brake Pads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 206-03-6
Front Brake Hose . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...206-03-7
Brake Caliper Body . . . . . . . . . . . . . . . . . . . . . . . . . . . . 206-03-7
Brake Disc . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..206-03-8
DISASSEMBLY AND ASSEMBLY
Brake Caliper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .206-03-9
206-03-2
Front Disk Brake
206-03-2
SPECIFICATIONS
General Specifications
Description
Specification
Minimum brake disc
26.0
thickness(discard
thickness)
Fluid
Brake fluid
ESZ-M6C55-A
Lubricant
High melting point grease Dow Corning 44/Niglube
Rx2
Pad
Material
JBUF85FF
Lining wear limit
1.0mm
Torque Specifications
Description
Nm
Brake hose bolts
30
Disc brake caliper bolts
115
Brake hose banjo bolt
12-14
Caliper body bolt
98-132
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206-03-3
Front Disk Brake
206-03-3
DESCRIPTION AND OPERATION
Front Disc Brake
Front Disc Brake Components
hydraulic seal between the piston and the cylinder
Item
Description
wall.
1
Front Disc Caliper Assembly
The top of the piston is machined to accept a sealing
2
Front Wheel Knuckle
dust boot. The outside diameter of the boot is
3
Brake Line Bracket
captured by a recess in the top of the cylinder bore
and the piston. The inside diameter of the boot fits
4
Caliper Retaining Bolt x 2
into the groove which is machined in the piston. The
5
ABS Sensor and Elec. Cable
piston is precision ground and chrome plated steel,
6
ABS Sensor Retaining Bolt
giving it a very hard and durable surface. The use of
7
Wheel Hub and Tone Wheel
abrasives or any attempt to re-machine the piston will
destroy the required surface finish.
8
Brake Disc Rotor
The sliding caliper feature automatically compensates
9
Front Spinle Nut
for lining wear. The abutment bracket is rigidly fixed to
10
Front Hub Cap Seal
the steering knuckle while the housing slides within
The dual piston hydraulic disc brake caliper is
the abutment bracket by means of two guide pins
constructed from a single casting which contains two
bolted to the housing.
piston bores in the inboard section of the casting.
Each caliper contains two pad assemblies. They are
(Inboard refers to the side of the casting which is
constructed of a stamped metal shoe with the lining
nearest the centreline of the vehicle when the caliper
integrally moulded to the shoe.
is mounted.)
When the brake pedal is applied, brake fluid is
The fluid inlet hole and bleeder valve hole are
displaced into the cylinders moving the pistons
machined into the inboard section of the caliper and
outward. This action forces the inner pad and lining
connect directly to the piston bores. Each cylinder
assembly against the rotor. The resultant reaction
contains a piston and seal.
forces the caliper housing and outboard pad assembly
The seal has a square section, and is located in a
inward against the rotor. The resultant forces of the
groove which is machined in the cylinder bore. It fits
pads on the rotor are equal. Braking torque is
around the outside diameter of the piston to provide a transferred from the outer brake pad abutments
G96751 en
206-03-4
Front Disk Brake
206-03-4
DESCRIPTION AND OPERATION (Continued)
through the caliper housing into the abutment bracket.
Guide Pin Adjustments
Braking torque from the inner brake shoe is taken
directly into the abutment bracket.
When the brake pedal is released the seal retracts the
piston into the cylinder and the caliper housing slides
outward releasing the brake.
Disc Pad Running Clearance
Piston Adjustment
Brakes Applied
Item
Description
1
Pad Abutment Bracket
2
Guided pin and boot assembly
3
Guide pin bolt
4
Piston
5
Piston dust boot
6
Pad abutment shim
7
Pads
Item
Description
The figure above shows the guide pin installation.
1
Piston Seal Distorted
Running clearance - the caliper head moves back and
forth on low friction guide pins. These guide pins and
2
Caliper Housing
intended to accommodate disc runout and bearing
3
Piston
float. If friction in the guide pin slide is high, instead of
the caliper head sliding back and forth, the disc will
Brakes Released
knock the piston into the head, causing a spongy
pedal on subsequent applications.
Wear Adjustment
Pad wear is taken up during brake application as
follows:
by the piston sliding past the seal to a new
position.
by movement of the caliper head on the slide pin.
Rotor
The cast iron disc is of the ventilated rotor-type and is
separated from the front hub.
Item
Description
1
Piston Seal Relaxed
2
Piston
3
Caliper Housing
The figures above show what happens to the pistons
and the seals during usage. The piston seals perform
the self-adjusting action. When the pistons are
pushed out by hydraulic pressure the piston seals
distort. When the hydraulic pressure is relieved the
seals relax and drag the pistons in, creating a disc to
pad running clearance.
G96751 en
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