12.2 FAULT DIAGNOSIS AND TESTING
rrouble
-ong brake pedal
dibration during braking
'oor braking performance
3rakes pull to one side
3rakes do not release
ixcessive pedal travel
Cause
Brake caliper piston or caliper guide
pins sticking
Worn
I damaged brake pads
Worn
1 damaged brake pads
Loose caliper mounting bolts
Insufficient grease on sliding parts
Foreign material
or scratches on
brake rotor contact surface
Damaged brake rotor contact surface
Leak
in hydraulic system
Air
in system
Worn
I damaged brake pads
Foreign material on brake pads
Brake caliper piston malfunction
Tandem master cylinder malfunction
Vacuum booster fault
Disconnected
or damaged vacuum
hose
Low brake
fluid level
Worn
I damaged brake pads
Foreign material on brake pad
Failing valves
in ABS valve block
Abnormal wear or distortion on front
brake rotor
Incorrect wheel alignment
Incorrect tire pressure
No brake pedal free play
Vacuum booster
binding
Tandem master cylinder return port faulty
Faulty valve
in ABS valve block
Leak
in hydraulic system
Air
in system
Remedy
Service or renew caliper or caliper
guide pins
Renew brake pads
Renew brake pads
Tighten caliper mounting bolts
Apply grease where necessary
Clean brake rotor contact surface
Renew brake
rotor
Repair leak. Check all pipework con-
nections. Refill and bleed the system
Check the system
for leaks and bleed
brakes
Renew brake pads
Examine brake pads and clean
or
renew as necessary
Renew faulty brake caliper piston
Service
or renew tandem master cyl- inder
Renew vacuum booster
Renew vacuum hose
Check for leaks, refill and bleed the
system
Renew brake pads
Examine brake pads and clean
or renew as necessary
Renew valve block
Examine front brake
rotor and service
or renew as necessary
Carry out wheel alignment. Refer to
Section
11, iv Service Data
Inflate tire
to correct pressure
Adjust brake pedal free play
Renew vacuum booster
Clean return
port on tandem master cy I i nder
Renew valve block
Repair leak. Check all pipework con
- nections. Refill and bleed the system
Check the system
for leaks and bleed
brakes
0
0
0
Issue 1 August 1994 16 X300 VSM
Tire Replacement And Wheel hterchanging
WARNING: UNDER NO CIRCUMSTANCES SHOULD CROSS-PLY TIRES BE FITTED.
When renewal of tires is necessary, it is preferable to fit a complete set.
Should eitherfront or reartires only (i.e.
notthe full set) show a necessityfor renewal, newtires must befitted to replace
the worn ones.
No attempt must be made to interchange tires from the front to the rear orvice-versa, as wear produces a characteristic
pattern on each tire depending upon its position on the vehicle. If this position is changed after wear has occurred, the
performance of the tire will be adversely affected.
It should be remembered that new tires must be balanced.
The radial ply tires specified here are designed to meet the high speed performance of this vehicle. Only tires of ident
- ical specification as shown in this section must be fitted as replacements. If two replacement tires are fitted to one axle,
they must be of the same type and pattern as those on the other axle, i.e. tires must be used in sets of four of the same
manufacturer and tread pattern,
not intermixed.
Tire Fitments
32 Liter 4.0 Liier 4.0 Liter SC 6.0 Liter 6.0 Liter 0
(Normally (Daimler & (UK, Euro, ROW
Aspirated) Federal
XJ12) XJ12)
Standard 225 160 ZR16 225 I60 ZR16 - 225 I60 ZR16
225
1 55 ZR16 225 I55 ZR16 - - 225 I55
ZR16
- 255 I45 ZR17 - -
Space saver 115/85R18 115/85R18 115185 115185 115185
(where fitted) RI8 R18 RI8
Recommended tires
The following tires are recommended:
225 I60 ZR 16 ...................................................... Pirelli P4000 E
225 155 ZR 16 ...................................................... Pirelli P6000
225 155 ZR 16 ...................................................... Dunlop SP Sport 2000
255
145 ZR 17 ...................................................... Pirelli P Zero
115185 R 18 Pirelli .......................................................
0
Recommended Winter (Snow) Tires
Tire designation:
225 I60 R 16 ...................................................... Goodyear Eagle GW M+S
225 155 R 16 ....................................................... Pirelli Winter 210 M+S
225 I55 R 16 ...................................................... Michelin 330 M+S
Only use winter tires in complete sets of the same type I size.
CAUTION: Tire directional indicators must rotate in a clockwise direction when viewed from the right-hand side of
the vehicle, and in an anti-clockwise direction when viewed from the left-hand side.
The recommended pressures for winter tires are shown in the table of inflation pressures on the following page.
0
X300 VSM Issue 1 August 1994 AI-95MY 10
0
Front 13 28 23 34
Rear 13 28 23 34
115 / 85 R18 (space saver wheel) - all vehicles (where fitted)
Front not applicable not
applicable 4,1 60
Rear not applicable not
applicable 41 60
Note: Tires other than those recommended by Jaguar must be inflated to the following cold inflation pressure:
2,9 bar (44 Ibf / in2) (both front and rear).
Snow Chains
0 Snow chains may be fitted to rear wheels only.
0 Use Jaguar snow chains.
0 The chains must not be used on roads which are clear of snow.
0 Maximum speed without snow chains fitted is 210 km / h. (131 mile / h).
0 Maximum speed snow
chains fitted is 48 km / h. (30 mile / h).
0
Table of inflation pressures (cold)
Recommended tires must be inflated to the following pressures:
Issue 1 August 1994 X300 VSM AI-95MY 11
