Rear brake just suddenly gone.. could master have just gone out??

[chocking]

Went for a short ride tonight and went around the first corner and pressed on the brake pedal and uhh oh.....no brake at all....

 

Rode it three days ago and all was okay...

No visible brake line leakage and no fluid anywhere....just no pressure at all...

 

I"ll ride it tomorrow to work with just the front right and then check it out tomorrow.

I"ll first check the rear fluid level and see if that is good..If that is good, will vacuum bleed..

Wondering if rear master cylinder would have suddenly gone..

This is an unexpected and never encountered problem..

 

Thoughts? ideas? comments?

 

Thanks

 

Clay

[Eck]

If the rear master cylinder went out it will not build up pressure inside the line.

1) Check to see if master cylinder is full...if it is, then

2) Pump the rear brake peddle with your foot. Do you have a firm peddle? If not, and the brake peddle bottoms out, then you have brake fluid by-passing in the master cylinder.

Check to see if rear master cylinder is full of fluid..No fluid..

1) Then you must have a leak ..somewhere..

2) Check rubber brake line along side right frame on bottom of bike. Is it wet anywhere?

3) Check brake line going to rear caliper..is it wet anywhere

4) Check rear caliper to see if it is wet / leaking. Remove saddle bag for visability.

If there is no fluid, you have a leak..

If the brake fluid is by-passing in the rear master cylinder, then bleeding the rear brakes will not gain yuo anything....except wasting your time in HOPES something will unexpectingly work..but then again for how long and will they work in an emergency..?

Do your brakes right and they my friend will pay you back the same respect.

Do your brakes "half ....." and they will pay you back the same respect..

Your choice..

[Rocket]

If the rear master cylinder went out it will not build up pressure inside the line.

 

1) Check to see if master cylinder is full...if it is, then

2) Pump the rear brake peddle with your foot. Do you have a firm peddle? If not, and the brake peddle bottoms out, then you have brake fluid by-passing in the master cylinder.

 

 

Check to see if rear master cylinder is full of fluid..No fluid..

1) Then you must have a leak ..somewhere..

2) Check rubber brake line along side right frame on bottom of bike. Is it wet anywhere?

3) Check brake line going to rear caliper..is it wet anywhere

4) Check rear caliper to see if it is wet / leaking. Remove saddle bag for visability.

 

If there is no fluid, you have a leak..

 

 

 

Also check at the steering neck, the left front caliper & left anti dive (linked brakes). You will most likely have an air pocket up by the steering neck & the mk1's do not have a bleeder nipple with the stock left front line. The Mk2 left front line has a bleeder nipple. There could also be seepage, from the hose between the reserviour & master cylinder, allowing air in over time.