Question about Harley Davidson FXDWG Dyna Wide Glide Motorcycles

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Installed new rear master cylinder '73 can't get it to build pressure after bleeding

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First, bleed the master cylinder. You do this by loosening the line nut on the output end of the master cylinder, press the foot pedal until it sinks all the way down, tighten the nut, release the pedal. Continue to do this in this EXACT sequence until all the air is out of the master cylinder.

Then using the EXACT sequence, bleed the rear brake caliper or the rear wheel cylinder. If your bike is equipped with drum brakes, you'll have to adjust the brake shoes to the drum.

Very important, DO NOT ALLOW THE MASTER CYLINDER TO RUN DRY DURING THE BLEEDING PROCESS. Make sure that the small hole in the bottom of the master cylinder is clear.

Good Luck
Steve

Posted on Sep 29, 2010

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1 Answer

No brakes on a 1986 honda accord


Did you get a good bleed with fluid coming out at all four wheels? If they bled good, and the pedal still goes to the floor, you need to check the brake master cylinder-it is probably shot with an internal leak. An internal leak will not let fluid pressure build up, so no brakes.

Did you keep the brake fluid reservoir from going dry while bleeding? If it went real low, air might have got back into the lines.

It is not uncommon when bleeding brakes on an older vehicle for the master cylinder to suddenly develop an internal leak and require replacement . Here's why: pushing the pedal all the way to the floor causes the master's piston to push in farther than ever before. The rubber cups then travel over a section of the cylinder not usually touched by the cups-old fluid can develop a crud there and when the piston pushes over it, the cups can get ruined. To avoid this when bleeding brakes, put a short piece of 2X4 wood block under the pedal. Then the pedal will not extend the master's piston beyond it's normal travel. Of course on a new master cylinder, you do not have to do this. A new master cylinder does require bench bleeding before installing, however, to ensure no air pockets develop from there.

Aug 24, 2014 | 1986 Honda Accord

1 Answer

Do you have to bleed master cylinder on 106 if master cylinder resorvior is empty


You don't have to bleed the master cylinder, you are going to have to prime it and bleed your entire brake system again. When you are bleeding your breaks you never let the reservoir run dry or the master cylinder starts to push air through the entire system. Not just on the line running to your front caliper. This is probably the reason you aren't getting pressure even when you pump the breaks.

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1 Answer

Replace brake master cylinder 1991


Hi Anonymous, for more information on your question please visit the websites below and good luck:
Motorcycle Brake Repair How to Replace Rear Brake Fluid on 2008 Harley...

Sep 19, 2013 | Harley Davidson FLHTCUI Electra Glide...

1 Answer

2005 Buell blast replaced rear master cylinder. it will not build pressure. When pumping for pressure the cylinder is bottoming out with the plunger . Is this another bad master cylinder?


The brake master cylinder needs to be BLED when you install it. It requires you pump the pedal and push brake fluid with the air that is in the line to the rear caliper where there is a bleeder. You pump the pedal a number of times say 10, then holding the pedal down you open the bleeder enough to let any trapped air and fluid to leak out. close the bleeder then let off the pedal and pump it up again. You will not have a hard pedal like original until you have nothing but fluid in the line/caliper. You will have to do alot of pumping and bleeding. This is not somthing that a first timer should attempt alone. you should have a manual there or someone who has done brakework before due to the reliance you need to have on the brake system working properly. You could always do a search on google for how to bleed brakes. should be some youtube vids out there.

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2 Answers

I install reman booster new master cylinder and the pedal goes to the floor what can i do


You probably need to start over...1st by bench bleeding the master cylinder...(you can do this on your truck...review the bleeding instructions...after completing this you need to be sure the master cylinder is full of brake fluid...you will need a helper...but your next step will be to bleed each wheel brake caliper or cylinder. Start with the right rear, next left rear, then right front to drivers side front...(farthest away to start) you may have a brake fluid leak...if not, your pedal pressure should continually raise...Hope this helps.

Nov 16, 2011 | 1992 Ford F250

1 Answer

Cant get any damm presure back in the rear brake even after bleeding sposter


If you can't get any pressure on the rear brake, you have one of several possible problems. Either you have a brake fluid leak somewhere, your rear brake master cylinder is bad, or your bleeding procedure is not correct. Let's take the simple one first, your bleeding procedure. This is easy to get confused on but it must be done in an exact sequence. To bleed the brakes, first depress the brake lever and hold it down. Then, open the brake bleeder valve and allow the air and fluid to bleed out. Then, close the bleeder valve. Release the brake pedal and give the master cylinder time to refill though the small hole in the master cylinder reservoir. Repeat the procedure until you get a good firm pedal Do not allow the reservoir to run dry during this process. If you have a fluid leak, you should be able to see that. If the master cylinder is bad, it could be allowing the fluid to bypass the pressure cup inside of it. If this is the case, the master cylinder should be rebuilt. If this was done and it is not building pressure, the rubber pressure cup could have been installed backwards. It goes in with the cupped side facing the back of the master cylinder or the end where the brake line connects to the master cylinder.

Good Luck
Steve

Jun 21, 2011 | 1993 Harley Davidson XLH Sportster 883

1 Answer

Bleeding the brakes ,But no fluide in the rear brakes


Check the master cylinder, pump up the brakes and crack the line at the master cylinder to the rear brakes, if no pressure and it was ran empty or is new part, bench bleed the master cylinder and recheck for pressure at the master cylinder, if you have pressure follow the brake line to the proportioning valve and crack that line before and after the fitting, good luck.

May 09, 2011 | Suzuki Sidekick Cars & Trucks

3 Answers

Installed new master cylinder and now getting low pressure to right rear and left front


OK.
You might have to bleed the brakes at the right rear and left front to build up pressure and get the air out of the system.

Also, did you 'bench bleed' the master cylinder? Manufacturers recommend and require that you do this in order to get any air out of the master cylinder before installing.

I hope I helped you.

Jun 21, 2010 | 1988 Plymouth Reliant

1 Answer

I filled my clutch resevoir and can't bleed. It


sounds like the master cylinder is not properly bleed. make sure there is no air in system, thats the most common reason that it does not build up pressure, did the cylinder run dry?, if so, more then likely you have air in system, if not, you may need a new slave cylinder.

Sep 25, 2009 | Yamaha V-Max Motorcycles

1 Answer

Replced front brake pads and calipers adjusted


Bleed the master cylinder first. You have to do that before you belled any calipers or wheel cylinder.

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