JAGUAR SERVICE - Terry's Jag
JAGUAR
SERVICE BULLETIN
Number Section
Sheet Date
L.1 Brakes
1 (of' 2)
January, 1960
DISC mAKE MASTER CYLINDER RIDONDITIONING
Models affected
All cars f'itted with disc brakes
A new type of master cylinder is now fitted to cars with
disc brakes and the assembly of internal parts, supplied as a re-
con:litioning kit (Part number 8250), can be incorporated in the
existing body of earlier type master cylinders when reconditioning master cylinders of that type. Individual parts are not supplied
separately.
The new type of master cylinder was introduced at the
following chassis numbers:
2.4 litre Mark 2
3.4 litre Mark 2 3. 8 litre Mark 2
Mark lX
XK.150 Open 2 seater
Drop Head Coupe Fixed Head Coupe
R.H. Drive
100473 150346
200092
773392
820066
827506 825127
L.H. Drive
125120
175141+ 210676 792257
832114 838590
836635
When reoonditioning a brake master cylinder of the type shown in Fig.1. attached, the following procedure should be adopted.
(1) Remove the dust excluder from the head of the master cylinder.
(2) Remove the circlip (using circlip type pliers if available, alternatively, round nose pliers ms:y be used). This will release the push rod oomplete with dished washer.
(3) Withdraw the piston and valve assembly complete with springs
and supports.
Discard the piston and valve assembly (items 3, 5, 6, 7, a, 9,
10 and 11 on Fig.1 ) and the circlip ( 12) ?
/Continued
Jaguar Cars Limited 2005
(5) Wash cylinder, push rod, rubber dust excluder in metcylated spirit
or clean brake fiuid. Check that cylinder bore is in good oondition and that dust excluder and dished washer are undamaged.
(6) As the piston and valve assembly are not anchored together, ensure
during fitting that the piston end of the valve stem locates in the piston bore. (See Fig.2.)
( 7) Lubricate the cylinder bore with brake fluid; insert the piston and. valve assenbly until the piston fitting sleeve engages in the mouth of the cylinder. Push the piston fixmly through the fitting
sleeve and remove the sleeve when the piston assembly is :fully home in the cylinder bore.
Note:
A special lubricant is packed between pi ston seals, therefore it is important that f'i.tting sleeve is not removed until piston is correctly looa.ted in cylinder.
(8) Ebsition the push rod and depress the piston suf'fioiently to allow the dished washer to seat on the shoulder at the head of the cylinder. Fit the new circlip and oheok that it f'ully engages
the gt"'ove.
(9) Fill the dust excluder with clean Wakefield Ru.bber Grease H. 95/59~
(Tube in kit).
(10) Reseat the dust excluder around the head of the master qylinder.
(11) Remove the existing identification t ab and fit new tab supplied.
Note:
During the whole of the servicing operation use only clean
brake fluid, Wakefield Crimson, to SAE. 70R1 ? After refitting the master cylinder to the car and bleeding the system, make
a careful cheCk of all units, pipes and fittings for leaks.
The part rwmbers of' the new type master cylinders are as follows:
2.~ litre, 3.4 litre, 3.8 litre Mark 2
XK.150
Mark l.X
C. 16469
0.16~70
0.16471
The identification tab f'itted to these types of master cylinders and the tab included in the reoonditioning leit 8250 have a widened
portion as indicated by the arrow in Fig.3.
/Cont'd???
Jaguar Cars Limited 2005
Service Bulletin L.1 continued
Sheet 2 (of' 2)
FIG I.
VALVE
!>PRING
FIG 2.
~
/
FIG 3
~
~
Jaguar Cars Limited 2005
JAGUAR
SERVICE BULLETIN
Number Section
Sheet Date
L.3 Brakes
1 (of' 1) March, 1 960
HANDBRAKE CONNIDTmG LINK
Models af'fected
XK.1 50 - Drop Head Coupe
- Fixed Head Coupe
Commencing Chassis numbers
R.H. Drive L.H. Drive
827510
836724
On cars with the above chassis munbers and onwards a longer hanibrake oonnecting link is fitted to improve the efficiency of the hand.brake. The connecting link has two holes at its lower end: a:nd for maximum efficiency the pin securing the link to the handbrake crossshaft lever IIB.lst be inserted in the lower hole.
The nfNI connecting link (Part number 0.16866) may be used to replace the previous link (Part munber C.8316) on cars prior to the
above chassis numbers.
' VACUUM CYLINDER LUBRICANT
Models affected Cars fitted. with a lockheed servo
The vacuum cylinder oil "Cosmolubic 1OO" reoomnended. for lubrication of the vacuum cylinder (see pages L.38 and L.4.2 of' the 2.4/3.4-
litre Service Manual) has now been superseded by "Shell Tellus 33".
"Shell Tellus 33" is available in eight ounce plastic bottles.
Jaguar Cars Limited 2005
jAGUAR
SERVICE BULLETIN
Number L.8 Section Brakes
Sheet l (of 1) Date June, 1961
INTRODUCTION OF CAST IRON BRAKE CYLINDERS
Models affected
2.4 litre ?ark 2 with disc wheels 2.4 litre Mark 2 with wire wheels 3.4 litre Wark 2 with disc wheels 3.4 litre Mark 2 with wire wheels 3.8 litre llark 2 with disc wheels 3.8 litre llark 2 with wire wheels
Commencing Chassis Numbers
R.H. Drive L.H. Drive
106897 106839 154315 154321 203627 203576
126283 126295 176964 176938 216474 216374
On cars with the above chassis numbers and onwards cast iron brake cylinder blocks replace malleable iron.
With this change the self adjustment arrangement is modified. The spring washer, shown in Fig.2, Section L of the Mark 2 Service Manual is no longer used, the retract ion being by a coil spring located in the piston.
Also, whereas the original type had a separate piston and backing plate (see Fig.l4, Section L of the llark 2 Service Manual) the new type is of integral construction with no end plate.
It is therefore necessary when removing or replacing the piston seal or dust seal to stretch the rubber over the end of the piston. When replacing the piston seal it should be well lubricated with brake fluid and great care taken not to scratch or damage the inside surface of the seal or the groove in the piston.
PRECAUTIONS TO BE OBSERVED WHEN RETURNING llA.STER
CYLINDERS AND SERVO UNITS
(All Models)
When returning master cylinder and servo units to the factory, distributors and dealers are requested to plug the hydraulic connections to prevent the possible ingress of mineral oil which may give a misleading iapression of the condition of the rubber seals.
Usually, it will be possible to use the plastic blanks provided in the replacement master cylinder or servoJaugunariCta.rs Limited 2005
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