Yup - that much lever deflection sure sounds like a hydraulic issue to me.
QUESTION for Gary: if the pads are glazed - can you sand them and reuse them? I would guess yes - but I have never experienced this issue myself.
Been using 11 mm. Brembo MC with 77-forward stock floating caliper for years. Big improvement. If bleeding doesn't help, remove the line from the MC, thread in a solid bolt to plug the hole, fill the reservoir, and pull the lever. If the pull isn't rock hard, you have a defective MC.
Well Griz is our winner! I put in a bolt and pumped her up. Once the air was out of the MC, lever was rock hard. So I inspected the rest of the setup and I think I over tightened where the line connects with the end connector and it was letting air in. This was a custom line and I just got over zealous on it. I may need to order a new line now but I'm pretty sure that is the culprit.
Thanks again guys.
When working on brake lines, its the copper washer that does the sealing. Very little torque is needed to achieve a leak tight seal. Use a new copper washer(s), so it has no surface damage. I use an "inch/pound" torque wrench, and use only 96 in/lbs of torque.Well Griz is our winner! I put in a bolt and pumped her up. Once the air was out of the MC, lever was rock hard. So I inspected the rest of the setup and I think I over tightened where the line connects with the end connector and it was letting air in. This was a custom line and I just got over zealous on it. I may need to order a new line now but I'm pretty sure that is the culprit.
Thanks again guys.
I would like to know how you order brake lines with the Banjo’s in different planes? I have been put off ordering from Banggood because there is no stipulation for this choice.Oh, I do look on eBay from time to time for a nice used TTR or TW 11mm MC. If I can find one for $20 to $30, I may indeed try it. It will require another Banggood brake line with ends oriented in the same plane, but they don't cost much.
Well, according to that Vintage Brake chart and recommendations, 15 mm would be near ideal MC for 4 x 38 mm pistons, while 14 mm may just be a bit small. However, caliper rigidity and hose expansion will also influence brake feel. Maybe there are master cylinders out there with a 9/16" bore? They would be slightly larger than 14 mm.On a stock XS650SH I changed the MC from 14mm to 12.7mm from a Virago 400. This gave a nice improved feel to the brakes without being too excessive.
Today's challenge is:
I have a Virago with twin front disks and each caliper has 2 opposed 38mm pistons. The stock MC is 16mm. I have been considering changing to a 14mm MC???
The Ratios for total caliper piston area divided by that of the MC are:
I have previously used the ratio guide as found at Vintage Brake:
- MC = 16mm Ratio = 22.6
- MC = 14mm Ratio = 29.5
https://www.vintagebrake.com/mastercylinder.htm
Does anyone have an ideal as to the recommended Ratio for twin disks with a total of 4 opposed pistons?
Thank you for any feedback.