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BRAKE SYSTEM
509
BRAKES
BLEEDING OF HYDRAULIC SYSTEM
The process of removing air from the hydraulic pipe
line and cylinders is known as “Bleeding”.
Bleeding operation should be carried out; whenever
you have worked on the brake system (Dismantled
any hydraulic brake part, e.g. wheel cylinder, TMC,
brake hose etc.)
When seals are worn, it is possible for the air to enter
the wheel cylinders without any sign of fluid leaking,
causing a ‘Spongy’ pedal which is the usual
indication of air in the system.
It is vital that absolute cleanliness is maintained
throughout the entire bleeding operation.All equipment
to be used must be entirely free from petrol, kerosene
or any form of mineral oil, as mineral contamination
spreads rapidly in the hydraulic system, causing a
dangerous deterioration of the rubber seals. Always
replace the rubber dust cover on each bleed screw to
prevent dirt entering the bleed tube during subsequent
bleeding operation.
CAUTION:
1. Brake fluid may cause damage to paint. So make
sure that brake fluid does not touch the painted
surface. In case brake fluid comes in contact with
painted surface, wipe immediately & clean the
surface with water.
2. Always use recommended brand of brake fluid.
3. Do not use the fluid bled from the system for
refilling in to the reservoir.
4. For effective brake bleeding use pressurized
systemand transparent bleeder tube. The bleeding
bottlemust be held above the level of wheel cylinder
for effective scavenging of air from the system
.
Bleeding Procedure is as follows:
Following points should be noticedwhile brake bleeding
process.
•
Brake fluid from sealed container of 250 or 500 ml
to be used.
•
Once some brake fluid is consumed fromcontainer,
the container should be discarded.
•
Separate funnel to be used for filling brake fluid in
the brake fluid reservoir, that funnel should not be
used for any other purpose.
•
Separate transparent tube to be used for removing
oil during bleeding. That tube to be used only for
brake bleeding purpose.
•
Bleed bottle should be separate from the brake
fluid bottle.
•
Bleeding Kit to made. The Kit should contain
bleeding bottle, transparent plastic tube, funnel for
filling, sealed brake fluid, spanner, cotton waste
(cloth) for bleeding purpose.
•
Bleed oil should be scrapped.
•
For topping up only closed container of 100 or 250
ml to be used.
NOTE:
Always bleed the system in a following sequence. It
should be such that, the farthest side from the TMC
should be bled first. So here it will be REAR LEFT
followed by Rear Right, Front Left and Front Right
respectively
.