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Author Topic: 82 XV750 Brake Issue  (Read 182 times)

Offline debo

  • Posts: 5
82 XV750 Brake Issue
« on: Aug 18, 2019, 15:03:47 »
I have an 82 XV750 that has no pressure in the front brake lever. The previous owner had rebuilt the caliper thinking that was the issue but still couldn't get any pressure so he figured it was the master cylinder. Before I did anything to the MC I bled the brakes, got some air out but still no pressure. I have a second 82 xv750 with a working front brake so I took the MC off that one and installed it on the first bike. Even with a MC that I know is working, still no pressure to the lever. Doing some research I saw some people said that air can get trapped in the banjo bolt or in the line and that sometimes you need to bleed the brakes for a really long time before you get any pressure. The bike has 4800 miles on it and everything on it looks almost new and looks like the bike has been very well kept. The second bike that I got the MC from has 22000 miles on it and is in very poor condition, even the MC looks like its in rough shape but still works. Im starting to get the idea that theres actually nothing wrong with the MC and I just need to keep bleeding the brakes until i get pressure, but im not really sure. Everything looks so new on this bike that I'm having a hard time thinking it could be bad parts, but these bikes are almost 40 years old so who knows. I have a braided steel brake line on the way, would a bad rotor cause this? Im also thinking of swapping the caliper with the caliper on the second bike because I know that one is working. Anyone have any idea what this could be or where I should be looking? Any help would be greatly appreciated!

Offline debo

  • Posts: 5
Re: 82 XV750 Brake Issue
« Reply #1 on: Aug 19, 2019, 13:13:57 »
I read that some have cracked the banjo bolt and pumped the lever a few times, tighten it back up and then continue bleeding the brakes as usual. I did this and after a lot of air came out and I was able to get pressure in the lever again.

Offline teazer

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Re: 82 XV750 Brake Issue
« Reply #2 on: Aug 19, 2019, 13:27:24 »
Bleed the M/C banjo the same way as you do with a caliper.   Pump and hold.  Crack it open.  Close and then release lever and repeat.

Another trick is to tap the brake lines to help air bubbles dislodge and rise to the banjo.  And try to pulse the brake lever fast again to dislodge bubbles into the reservoir.

In cases where the caliper banjo is higher than the bleed screw, you might have to repeat the process and crack the caliper banjo to let air out.

Just keep in mind that air rises to the highest point and often gets trapped there.  Your task is to get the air to travel up to the banjo blot where it can be set free.