Front Disc Brake (4.2L): Specifications
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2009 Jaguar XKR, 2009 Jaguar XK8, 2008 Jaguar XKR, 2008 Jaguar XK8, and 2007 Jaguar XKR. However, it is still accessible from the selected car via links, so may be relevant.
Brake Disc
| Item | Specification |
|---|---|
| Disc type | Ventilated |
| Disc diameter | 326 mm (12.8 in) |
| Disc diameter (Supercharged models) | 355 mm (13.9 in) |
| Disc diameter (vehicles fitted with Alcon braking system) | 400 mm (15.75 in) |
| Disc thickness (new) | 30 mm (1.18 in) |
| Disc thickness (Supercharged models new) | 32 mm (1.26 in) |
| Disc thickness (vehicles fitted with Alcon braking system new) | 36 mm (1.42 in) |
| Minimum disc thickness (service limit) | 28 mm (1.10 in) |
| Minimum disc thickness (Supercharged models service limit) | 30 mm (1.18 in) |
| Minimum disc thickness (vehicles fitted with Alcon braking system service limit) | 34 mm (1.34 in) |
| Disc thickness variation (new) | 0.008 mm (0.0003 in) |
| Maximum disc run-out - installed | 0.09 mm (0.0035 in) |
| Maximum hub face run-out - installed | 0.0135 mm (0.00053 in) |
Caliper and pads
| Item | Specification |
|---|---|
| Caliper | Floating cast iron caliper with 60 mm single piston |
| Caliper (Supercharged models) | Floating cast iron/aluminum composite caliper with 60mm single piston |
| Caliper (vehicles fitted with Alcon braking system) | Opposed aluminium caliper with 6 pistons. Piston diameters 38.1 mm, 34.9 mm and 30.2 mm |
| Minimum pad thickness (service limit) | 2 mm (0.078 in) |
| Minimum pad thickness (vehicles fitted with Alcon braking system service limit including brake pad back plate) | 8.5 mm (0.335 in) |
Torque Specifications
| Item | Nm | lb-ft | ||
|---|---|---|---|---|
| Brake caliper anchor plate - bolts*(1) | 115 | 85 | ||
| Brake caliper - guide pins | 28 | 21 | ||
| Brake caliper - guide pins (Supercharged models) | 58 | 43 | ||
| Brake hose to caliper - union | 42 | 31 | ||
| Brake hose to caliper - union (Supercharged models) | 42 | 31 | ||
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NOTE:
Alcon brake system can be identified by the existence of halfmoon shaped marking in the friction surface of the brake disc.
Torque Specifications - vehicles fitted with Alcon braking system
| Item | Nm | lb-ft | ||
|---|---|---|---|---|
| Brake caliper anchor plate to wheel knuckle - bolts*(1) | 108 | 80 | ||
| Brake caliper to caliper anchor plate - bolts | 115 | 85 | ||
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