Disc: Other Jaguar S-type I

Brembo

Brembo calipers and discs provide higher performance braking using the existing hydraulic braking system. The brakes are installed to the vehicle using unique vertical links, hubs, hydraulic hoses and disc shields. The front brake disc consists of a ventilated, cross drilled disc, bolted to a disc carrier. The disc assembly is mounted on the wheel studs and clamped between the wheel and hub. A unique feature of the front disc is the slanted (non radial) ventilation webs which lean opposite to the direction of rotation. This design enables heat generated by the disc to be dispersed by air entering at the center of the disc and being forced outwards through the cooling ducts. Due to the use of fixed calipers in place of the standard floating caliper, certain lateral dimensions on the vertical link and hub are critical to achieve correct clearance and operation of the brakes. Therefore special vertical links and hubs set within a certain tolerance are installed with Brembo brakes. The front discs are specific to the left and right side of the vehicle. The left disc can be identified by a groove running around the circumference of the outer disc wall. (Scheme 31)

Modified disc shields are installed to accommodate the larger diameter discs. The 4 cylinder brake caliper is rigidly attached to the vertical link by an anchor bracket. The caliper is a split assembly with 2 pistons in each side of the caliper. The 2 pairs of opposed pistons act directly on the brake pads mounted on each side of the disc. Stainless steel hydraulic lines connect the calipers to the existing brake lines. It is important that these lines are aligned correctly when installed to prevent them interfering with steering and suspension components. The Brembo disc brakes require no adjustment.

Scheme 31

Except Brembo

The brake disc is mounted on the wheel studs and is clamped between the wheel and hub. Cooling ducts run through the center of the brake disc to provide the required ventilation to keep the disc cool under operating conditions. The caliper carrier, which is secured to the vertical link by 2 bolts, carries the single-piston caliper housing. The caliper housing is secured to the caliper carrier by 2 guide pins and an anti-rattle spring. When the brakes are applied the caliper housing piston pushes the brake pad in front of it, towards the brake disc. This movement forces the caliper housing to move along the guide pins in the opposite direction of the piston, applying the second brake pad. The brake disc is therefore gripped between the 2 pads. As brake pressure is increased the grip on the brake disc is increased to slow down the rotation of the wheel. The disc brakes require no adjustment.

Brembo calipers and discs provide higher performance braking using the existing hydraulic braking system. The brakes are installed to the vehicle using unique hub carriers, hubs, hydraulic hoses and disc shields. The rear brake disc is a single piece construction which is ventilated and cross drilled. The disc is mounted on the wheel studs and is clamped between the wheel and hub. Cooling ducts run through the center of the brake disc to provide the required ventilation to keep the disc cool under operating conditions.

Modified disc shields are installed to accommodate the larger diameter discs. Due to the use of fixed calipers in place of the standard floating caliper, certain lateral dimensions on the hub carriers and hubs are critical to achieve correct clearance and operation of the brakes. Therefore special hub carriers and hubs set within a certain tolerance are installed with Brembo brakes. The 4 cylinder brake caliper is rigidly attached to the vertical link by an anchor bracket. The caliper is a split assembly with 2 pistons in each side of the caliper. The 2 pairs of opposed pistons act directly on the brake pads mounted one each side of the disc. Stainless steel hydraulic lines connect the calipers to the existing brake lines. It is important that these lines are aligned correctly when installed to prevent them interfering with steering and suspension components. The Brembo disc brakes require no adjustment.

The brake disc is mounted on the wheel studs and is clamped between the wheel and hub. Cooling ducts run through the center of the brake disc to provide the required ventilation to keep the disc cool under operating conditions. The caliper carrier, which is secured to the hub carrier by 2 bolts, carries the single piston caliper housing. The caliper housing is secured to the caliper carrier by 2 guide pins and an anti-rattle spring. When the brakes are applied the caliper housing piston pushes the brake pad in front of it towards the brake disc. This movement forces the caliper housing to move along the guide pins in the opposite direction of the piston, applying the second brake pad. The brake disc is therefore gripped between the 2 pads. As brake pressure is increased the grip on the brake disc is increased to slow down the rotation of the wheel. The disc brakes require no adjustment.

PARKING BRAKE

The parking brake hand lever is mounted on the transmission tunnel and incorporates the ratchet mechanism and release button. The front cable is routed from the hand lever, under the carpet through to an abutment bracket adjacent to the transmission tunnel, and then connected to the relay lever. The relay lever is attached to a mounting plate by a center bolt on which it rotates The relay lever mounting plate straddles the transmission tunnel and is secured by 4 bolts. The relay lever acts as a center pull system to transmit the force from the hand lever to the rear brakes shoes. The equalizer which is positioned in the center of the rear brake cables balances the force that is applied to the rear brakes. The rear brake cables are linked together by a cable that passes through the rear hub carrier and connects to a brake shoe expander lever. Application of the parking brake causes the rear cables to pull on the expander levers, the expander lever mechanism rotates on a pivot pin to force the brake shoes outwards to contact the brake drums.

The parking brake cables are adjusted by the rotation of a nut on the adjuster rod. The parking brake shoes are adjusted by means of a manual adjustment mechanism at each set of shoes. See PARKING BRAKE under ADJUSTMENTS. If the vehicle is driven above 3 MPH with the parking brake applied, a warning lamp and text message will appear on the message center. The message clears when the brake is released or the speed drops below 2 MPH.

BLEEDING BRAKE SYSTEM

Note. Ensure the brake fluid level does not fall below the fluid reservoir MIN (minimum) mark when bleeding the brake system.

Note. Brembo calipers and discs are available only on the 2000 XJ and XK series vehicles

BLEEDING PROCEDURE

1. Raise and support vehicle. Open engine compartment hood and fit paint protection covers to fenders.
2. Fill fluid reservoir to the MAX (maximum) mark.
3. Prepare left front brake caliper for bleeding. Remove dust cap and connect a bleed hose and fluid container to bleed nipple.
4. Bleed brakes by: Applying pressure to brake pedal. Opening the bleed nipple (outside bleed nipple on Brembo brake systems). Fully depressing the brake pedal. Closing the bleed nipple, and releasing the brake pedal. Wait 2 seconds to allow system to prime. Repeat until air-free brake fluid is expelled from caliper. On Brembo brake systems, repeat for inside bleed nipple before proceeding to next caliper location.
5. Ensuring that fluid level in master cylinder reservoir does not fall below the MIN mark, repeat procedure for each brake caliper in proper sequence. See «BRAKE BLEEDING SEQUENCE»(ref-139256-S21480195232004022400000) table. Tighten bleed nipples to specification. See «TORQUE SPECIFICATIONS»(ref-139256-S33553347492004042900000) .
6. Ensure that brake fluid level is at the MAX mark on reservoir and fit cap. Start the engine and check for correct brake pedal travel and pressure. Apply the brakes and check the system for leaks. Top off brake fluid as necessary, bringing fluid level to the MAX mark.

BRAKE BLEEDING SEQUENCE (1)

Parking Brake Cable

Raise and support vehicle. Make sure gear selector is in NEUTRAL position and parking brake lever is released. Rotate adjusting nut until the parking brake can be applied by raising the parking brake lever 3 to 5 clicks. (Scheme 32)

Scheme 32

Parking Brake Shoes

1. Make sure gear selector is in NEUTRAL position and parking brake lever is released. Raise and support vehicle. Remove both rear wheels.
2. Install 3 lug nuts to secure brake disc to hub and tighten to 15 ft lbs. (20 N.m). Remove plug from access hole and rotate brake disc until access hole is aligned with adjuster. (Scheme 33)
3. Using a flat-blade screwdriver, rotate the adjuster counterclockwise until the brake disc cannot be rotated. (Scheme 34)
4. Rotate the adjuster gradually clockwise until the brake disc rotates freely. (Scheme 35). Install access hole plug.
5. Repeat parking brake shoe adjustment procedure on opposite-side of vehicle.
6. After parking brake shoe adjustment is complete, adjust parking brake cable. See «PARKING BRAKE CABLE»(ref-139256-S02781208772002042900000).
7. Remove lug nuts and install rear wheels. Install lug nuts and tighten to specification. See «TORQUE SPECIFICATIONS»(ref-139256-S33553347492004042900000). Lower vehicle.

Scheme 33

Scheme 34

Scheme 35

Note. Brake pads must always be replaced in axle sets.

Removal - Front (Brembo)

1. Open engine compartment hood and fit paint protection covers to fenders. Raise and support vehicle. Remove front wheels.
2. Loosen brake fluid reservoir cap and position a cloth around the reservoir to collect any fluid spillage.
3. Remove the "R" clips from the brake pad retaining pins, remove pins and anti-rattle spring from caliper. Remove and discard disc brake pads. see scheme 6
4. Clean and inspect caliper and all associated parts.

REAR BRAKE CALIPER

Note. Special tool required: Brake Pedal Holding Tool (JDS 9013). see scheme 38

Note. Replace brake pads in sets only. DO NOT mix semi-metallic and non-metallic pads.

Removal - Rear (Brembo)

1. Open engine compartment hood and fit paint protection covers to fenders. Raise and support vehicle. Remove wheels.
2. The following must be carried-out to minimize brake fluid loss when disconnecting the brake hose. Connect bleed tubes and containers to the left front and left rear caliper bleed nipples. see scheme 9 Open left front and left rear caliper bleed nipples. Using the Brake Pedal Holding Tool (JDS 9013), depress and hold down brake pedal until the brake pedal is held 2.4" (60 mm) down from its released position. Adjust the brake pedal holding tool by rotating adjusting wheel. see scheme 10 Close left front and left rear caliper bleed nipples. Remove bleed tubes and containers.
3. Remove union bolt from the caliper line and discard sealing washers. see scheme 30 Remove line from caliper and install plug into caliper and line.
4. Remove pins and anti-rattle spring from caliper. Remove and discard brake pads. see scheme 18
5. Remove caliper mounting bolts and remove caliper from hub carrier. see scheme 31
6. Clean and inspect all associated parts.