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Lotus Service Notes Section JL
3. The cable adjuster may then be tightened to remove slack until the 'click' specification is achieved. Check
that there is no brake drag with the lever fully off.
Parking Brake Shoes
Unless the parking brake shoes are mal-adjusted, the shoe material should suffer little wear. To remove
the shoes, remove the road wheel, fully slacken the brake shoe adjuster, and remove the brake disc (see below).
Mark the shoes with their fitting position before removing the steady pin and spring from each shoe by turning
the pin 1/4 turn. Allow the shoes to fold outboard and release from the adjuster. Remove the upper retraction
spring, and lever the shoes from the adjuster mechanism slots.
Refit in reverse order.
Parking Brake Lever
The parking brake lever is mounted in a steel bracket which also houses the gearchange lever. The
mounting bracket is bolted to an alloy support channel running down the centre of the cabin floor, to which it
is secured by 12 setscrews. The brake lever ratchet pawl operates a micro switch to light the ‘brakes’ tell tale
lamp in the instrument panel whenever the ignition is switched on and the parking brake is applied. The short
front cable is connected to the lever assembly by a clevis pin with spring retaining clip. When carrying out any
work in this area, take care not to damage or misroute the electrical main harness.
The two secondary cables are routed through the lower wishbones and into the brake backplates where
the cable nipples connect to the actuation levers by a 1/4 turn.
JL.6 - BRAKE DISCS
All four wheel brakes use a cast iron brake disc which is sandwiched between the wheel and its hub flange,
being centralised by the hub spigot, and transmitting torque via the clamping force of the road wheel bolts. A
countersunk screw is used to retain the discs for convenience when servicing. The 350 x 32 mm front discs
and the 332 x 26 mm rear discs are all internally ventilated with directionally curved cooling vanes, and have
cross-drilling to aid pad scouring available as an option. The rear discs also incorporate a 185 mm inner drum
to accommodate the parking brake function.
The condition of the brake disc friction surface is a major factor in brake performance and feel, with a good
surface quality and minimal run-out and thickness variation being required. After an extended lay up, some
surface corrosion may develop on the discs which will cause a degradation in braking quality until the surfaces
are cleaned up by normal brake action. Excessive run-out or thickness variation as a result of overheating
or extended wear, may cause brake judder and/or extended pedal travel due to pad ‘knock off’. Scoring and
ridging of the braking surfaces will be exacerbated by operation in dusty or unmetalled road environments, and
will degrade braking performance.
No skimming or re-surfacing of the brake discs is recommended. If the disc becomes badly scored, or
is out of specification in any way, it should be renewed. NOTE: Ensure that there is no discernible free play
in the wheel bearings before attempting to measure brake disc run-out. If disc run-out exceeds the service
maximum, check the hub face run-out before replacing the disc.
Brake disc thickness
New - front 32 mm
- rear 26 mm
Service minimum - front 30 mm
- rear 24 mm
Runout
New maximum 0.06 mm
Service maximum 0.10 mm
Hub
Disc mounting face run-out max. 0.05 mm
Front Disc Replacement
1. Remove the road wheel.
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