Question about 2001 Yamaha YZF-R1

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Hi,i am assuming you have no front brakes,bleed the master cylinder before you try the calipers,to do this,simply pump up some brake pressure with the lever,hold the lever against the bar (fully applied)then crack the banjo bolt that holds the brake line onto the master cylinder,you should see air escape,retighten the banjo bolt,repeat the procedure untill all the air is gone,it doesnt take much air to stop the master cylinder working,once you have the master cylinder bled,then rebleed the calipers in the normall fashion,dont forget to put a rag down to protect the paint on your fuel tank,brake fluid loves paint...hope this helps,,cheers

Posted on Feb 06, 2010


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1. I suspect deteriorated brake fluid, some air in the brake lines and tired flexible brake hoses which are past their useful life.

If the brake fluid has not been changed in the past 12 months then have the brakes bled and new DOT 4 spec brake fluid replaced in the system. (Brake fluid must be bled out and changed at least every 2 years). At the same time look for signs of any minor brake fluid leaks or fluid weeping.

2. In a vehicle of that age I would also be replacing all flexible brake hoses before bleeding the brake system again. These flexible hoses deteriorate badly with age and will swell significantly when you apply pressure to them contributing to a soft pedal feel. This is not expensive to have done and, given the safety importance of the braking system, it is imperative to keep the brakes in decent working condition. Ensure you only use very good quality brake hoses.
Once the brake hoses are fitted, the brake system is bled and the new brake fluid is added into it at the same time.

With everything tight, new hoses and new fluid in the system you should have a solid pedal assuming everything else is ok.
(I doubt that the ABS sensors on your vehicle have anything at all to do with the soft pedal you are concerned about but we cannot test this. It is much more likely that the issue is more fundamental as explained above.
On this site we frequently do not have enough information about a vehicle to offer as much information and comment as we would like).

I hope this helps.


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