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John FISH Curtis

Brake fluid change.... clutch as well?

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One of the jobs this winter is to change the brake fluid.

Do I need to clean through the clutch fluid as well? If so, how best as never done a clutch?

Car is a 2007 Exige S, brakes fluid last changed 28months/4000 miles ago by Lotus Silverstone. 

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I agree you might be surprised how dirty the clutch fluid gets 

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The easiest way to bleed the brakes and clutch is with an Ezi-bleed kit from Halfords or similar. It uses tyre air pressure to pump new fluid into the reservoir as you bleed it out of the slaves. Clutch is the same process as the brakes. Just attach a length of fish tank air tube to the slave valve and open the valve, catch the fluid in a jam jar.   I always bleed the clutch first, then the rears, then the front. That ensures the front brakes have the best fluid, they get hot.

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Replace the clutch fluid the same way as the brakes.  Open the bleed nipple, drain the fluid, keep the reservoir topped up.  In practice, you'll need to pump the pedals, apply pressure to the reservoir, or apply vacuum to the bleed nipple.  Any method will work for this job, depending on the equipment you have handy and how many people on hand.  I find the vacuum method is the simplest for replacing the fluid.  A pressure bleeder may be better for actually bleeding air from the system.  Pumping the pedals is a bit fiddly with two people, and a right pain with only one.  Simple gravity works for the brakes, but is very slow, not so good for the clutch because the slave cylinder is quite high.

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