Bedienungsanleitung Cervelo General - 2012 (Seite 47 von 68) (Englisch)

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I General User Manual 47

21.5.2 Vapour bubble formation

›Vapour bubble formation can occur if the brakes

are operated continuously for some time, e. g. dur-

ing a long steep descent.

Instead of applying gentle pressure continuously

with the brakes, operate them for shorter periods,

with more force if necessary, releasing the brake

lever intermittently.

›Vapour bubbles form if water in the brake uid

heats up, evaporates and forms bubbles in the

brake system.

As these are easily compressed, the brake lever travel

distance increases.

When transporting or storing the bike upside down,

air bubbles can form in the brake system uid reser-

voir.

If you then use the bike, the brakes could fail and

cause a serious accident.

Once the bike is in the correct riding position, pull the

brake lever several times to check whether the brakes

respond normally.

If not, adjust them as follows:

›Adjust the brake lever so it is parallel to the ground

and operate it slowly several times so the bubbles

return to the reservoir.

›If the response is still poor, the brake system must

be vented. Have this work carried out by a special-

ist cycle shop.

Brake pads and brake blocks are wear parts. Have the

brake pads of hydraulic disc brakes checked regularly,

and replaced if necessary, by a professional bike

workshop.

21.5.3 Cleaning the brake system

If the brake blocks come into contact with oil or grease,

they must be replaced. If the brake disc comes into con-

tact with oil or grease, it must be cleaned as otherwise its

braking performance will be drastically reduced.

›Clean and maintain the brake system using isopro-

pyl alcohol, soapy water or a dry cloth. Do not use

commercially available brake cleaning agents or

agents to prevent braking noises as these can dam-

age components such as the seals.

21.5.4 Fitting/removing the wheel

›When removing the wheel, we recommend you

use a brake block spacer. This prevents the piston

om being pushed out if the brake lever is oper-

ated once the wheel has been removed. This also

prevents air bubbles in the expansion vessel om

entering the system.

›If the brake lever is operated and the brake block

spacer is not inserted, the pistons may extend r-

ther than normal. Put the bike in an upright posi-

tion to push back the brake blocks. Use a clean,

at screw driver or tyre lever and be carel not to

scratch the brake blocks. If the brake blocks are

not tted, push the piston back carelly without

damaging it. If you have trouble pushing back the

brake blocks or piston, remove the reservoir cap

and try again. Note that some oil may ow out the

reservoir.

›Aer tting the wheel, check that the quick-release

lever is on the side opposite the brake disc. If it

is on the same side as the brake disc, there is a

danger of the lever and brake disc obstructing one

another and this could also reduce the clamping

force of the quick-release device.

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