Lotus 2004 Eleven Service Notes page 522

Lotus Service Notes
Access to the brake master cylinder reservoir is available via a small panel in the driver's side front body;
release the screw fastener using the tool provided in the roll over bar backstay, and withdraw the panel. To
refit, engage the tongue beneath the front end of the aperture, and secure the rear end with the fastener. Note
that to avoid erroneous low fluid tell tale activation under extreme track use, it may be necessary to fill the fluid
reservoir to the base of the neck.
Option
An optional brake upgrade comprises larger front discs (308mm vs. 288mm) mounted on alloy centres
and clasped by A.P. Racing 4- pot callipers.
Brake Pad Bedding
If new brake pads and/or discs are to be fitted, a bedding-in procedure should be followed:
WARNING; This procedure should be carried out only on a closed track, paying appropriate regard to
any other track users. Do not attempt on the public highway.
The purpose of brake pad bedding is to:
- Transfer a layer of friction material onto the disc faces to achieve maximum performance;
- Stabilise compressible materials to avoid a spongy pedal;
- Boil off volatile elements in the friction compound;
- Align the pad and brake disc surfaces for full contact.
If the pads are not bedded in correctly, or are used aggressively straight after fitting, pad glazing may oc-
cur. This condition results from resins in the pad material crystallising on both the pad friction surface and the
brake disc surface, producing brake judder and vibration. Also, rapidly escaping volatile elements and moisture
from the resin, in seeking an immediate escape route out of the friction compound, can create small fissures
that can lead to cracking and chunking of the material.
Bedding Procedure;
- To generate some heat in the discs and pads, perform 4 to 6 stops with medium brake pressure from
around 70 mph (110 km/h) to 40 mph (60 km/h), allowing around 30 seconds between stops. The pad
temperature should not exceed 400 degrees C.
- Immediately after this procedure, carry out one high speed stop with medium to heavy brake pressure,
without activating the ABS, from around 80 mph (130 km/h) to 40 mph (60 km/h).
- Perform 3 or 4 recovery stops to clean the discs and pads, using light pedal pressure from around 70 mph
(110 km/h) to 40 mph (60 km/h).
- Repeat the high speed stops, including the recovery stops, a further 2 or 3 times. The brakes may now
be considered fully bedded.
New Pads on Used Discs
If new brake pads are to be fitted on used discs, it is recommened to chamfer the edges of the pad to
allow optimum bedding.
Parking Brake
Immediately after track use or hard brake usage when the discs are still hot, if possible, avoid using the
parking brake (chock wheels) to prevent heat transfer into the pads and brake fluild.
2-ELEVEN.K - COOLING
The 2-Eleven uses the standard horizontally mounted radiator, with twin cooling fans on its underside.
The fans are switched individually by the engine ECM in conjunction with a fan control module mounted in
the chassis front well, behind the radiator. One fan is switched on at 98°C on rise, off at 93°C on fall, with the
second fan motor run in parallel, and switched on at 103°C on rise, off at 98°C on fall.
Twin front mounted oil/air coolers (std. Exige hot climate spec.) are fitted, one ahead of each front wheel.
An engine intake air chargecooler radiator is rubber mounted behind the engine, with cooling airflow gathered
by body apertures alongside the rear of the cabin, and fed via convoluted ducting to a collector on the forward
side of the chargecooler. Air exhausting from the chargecooler radiator escapes via a rear transom aperture.
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2-Eleven