Question about 1995 kawasaki VN 750 Vulcan

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Vn750 1985 brakes. I have reconditioned master cylinder but still have front brake spongy but will pump up to feel normal then after a short time have gone spongy again. Thanks for any help

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You still have air bubbles trapped on the fluid hose, going to the brakes. To get rid of them, pump three times, hold the brake grip, unscrew the breathing tap down on the brakes, let it bleed, seal it and pump again. During all this procedure, you must always have the fluid reservoir on the steering bar, full, and closed to create pressure downwards. If done right, should have it in no more than 20min.

Posted on Sep 08, 2010

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1997 mercury sable gs 3.0l replaced master brake, still having brake pedal feeling spongy and slowly traveling down. i bench bled master brake and bled brake right rear left rear right then front.


If the master cylinder is replaced, care must be taken to prime the new master cylinder by removing all of the air and completely filling it with brake fluid. The spongy feeling is air that is still in the circuits. You will need to bleed the back brakes as well as the front ones again. The order that you bled them seems correct, but perhaps there remained some air in the main trunk lines.

For the best results 2 people are needed. Start at the further distance wheel cylinder and bleed at least three (3) master cylinder reservoir volumes of fluid (back brakes). Bleed the fluid with use of a piece of tubing attached to the bleed port that is long enough to reach almost to the bottom of a long neck or tall clear jar (clear drink bottle works well). When the bleeding begins, after one or two brake pedal pushes, make sure that the end of the tubing is below the surface of the fluid and keep it under. It best to have a clear bleed line (to observe air). Keep pumping the brake pedal while being careful to not completely empty the master cylinder reservoir (leave 1/4 full always). Repeat the same technique for each wheel cylinder with at least two (2) reservoirs full for front brakes. Partially close the bleed ports when almost finished (at least 5 pedal strokes without exit of any air). Completely close the ports during the down stroke of the brake pedal, with the tubing still attached. Be sure each bleed port is closed snuggly.
Most of the brake fluid can be reused, but not the darker portion at the bottom of the jar.

Oct 09, 2016 | 1997 Mercury Sable

1 Answer

2001 Silverado 2500 HD Why Rear brakes don't work after I installed new hydro-boost power booster, master cylinder, calipers, and pads. I bled master cylinder before installing, and brakes beginn


Hello Patricia,

Have you checked the master brake cylinder reservoir for brake fluid loss?

I don't suspect the master cylinder as you have replaced it... but am more suspect of a leaking brake line or fitting which should have
been discovered when you had the system bled.

The only time I ever had a rear brake problem with a 2500 series Chevrolet was due to seized rear brake caliper guide pins...as your calipers are also new that is not your problem.

If your brake pedal feels spongy and travels to the floor board you have air in the system, a brake fluid leak or a failure in the power steering system, such as a broken hose, broken power steering pump drive belt, or failed pump, would result in a loss of pressure to both the hydro-boost and steering.

Find more information here:

. Hydro Boost Power Assist Systems Operation Diagnosis and Repair

Jul 23, 2017 | 2001 Chevrolet Silverado 2500HD

1 Answer

The front/driver's side of my van is leaking brake fluid very fast.


sounds like a broken brake line or a brake master cylinder problem. the master cylinder has a resevoir ontop were you add brake fluid. Does your brake pedal feel spongy? if so sounds like your master cylinder needs to be replaced.

Mar 15, 2011 | 1999 Plymouth Grand Voyager

1 Answer

Replaced master cylinder, front brake calipers and rear calipers,


BY TRUCK HAVING ABS BRAKE.YOU NEED A SCANNER TO BLEED BRAKES THE SCANNER HAS TO RESET OPERATION OF THE BRAKE HYDRALIC SYTEM BEFORE YOU CAN BLEED SYSTEM.

Jul 13, 2010 | 2005 Ford F 350 Super Duty

1 Answer

Suzuki GSX 600 F (1998) soft front brake, I have upgraded to braided hoses but brake lever still feels spongy, can I upgrade the master cylinder or do I have to accept them as they are?


you can renew the master cylinder seals, the calipar seals can also cause the lever to feel spongy, they grip the pistons and pull them too far back into the bores instead of letting them return just enough to realease the brake, in this condition when you apply the brake most of the lever travel is just pushing the calipar pistons out to reach the pads and the little travel that is left is pushing the pads on to the disc, hense the spongy feel

Jun 12, 2010 | 1998 Suzuki GSX 600 F (Katana)

1 Answer

Installed new master cylinder can't get the brakes blead.


There are two solutions offered here. Please read them both before starting.

1. Find a helper. Take the brake lines back off the master cylinder. Make sure the fluid reservoir is full. wearing safety glasses and rubber gloves press your thumbs on the holes in the master cylinder where the lines hook up. Have your helper push the brake pedal down. Keep doing this until the fluid pressure moves your thumbs away from the master cylinder and squirts out of both the front and rear holes. Work with your helper to hook up the lines without loosing the fluid in the master cylinder. Check the fluid in the master and fill it up. DO NOT ASSUME YOU HAVE BRAKES. Test the brakes carefully. If they are still spongy you have to bleed the lines at the wheels. Start with the longest line and work to the shortest. Bleed all four one at a time until you have a steady stream of fluid coming out when the pedal is pushed. Then carefully test the brakes. If the pedal is good you can drive the vehicle.

2. If you can't find a helper or are worried about fluid squirting around the shop you can do the same thing by making two short lines for the front and rear master cylinder openings and submerging the lines in a pan of fluid. Pump the brakes until no air bubbles up in the fluid and fasten the lines as per above. once again DO NOT ASSUME THAT YOU HAVE BRAKES UNTIL YOU CAREFULLY TEST THEM. Bleed the lines as described above if you are not happy with the pedal feel. Good Luck.

Mar 20, 2010 | 1997 Toyota T100

3 Answers

Brakes are still spongy after changing the pads, one caliper, and master cylinder. bled front brakes.


I just went to Brake Masters this morning and had them replace the Master Cylinder since I was experiencing the pedal very spongy and going to the floor. When they replaced the Master Cylinder and they gave me back the car, the brakes were still spongy and going to the floor. I addressed this to them and they took another look at it, but when I took it for a second time, the brakes were extremely spongy. It was almost like they gave me back my car in worst condition to when I brought it in. Can you help?

May 21, 2009 | 1999 Chevrolet Silverado 1500

2 Answers

Changed caliper on 2005 ford freestar and now brakes are spongie.


Use a vacuum pump brake bleeder starting at the furthest point from the master cylinder. They cost abt $35. Be sure to keep master cylinder full... :)

Apr 11, 2009 | 2005 Ford Freestar

2 Answers

Brakes feel spongy.when pressed hard goes nearly to floor.if pedal released slightly and pressed again feels normal.this is a 1997 toyota caldina GGT with abs.have bled brakes and sgimmed discs.any ideas?


Either you did not bleed the brakes properly or they need adjusted. (rear only) Front most likely are disks. If you put pads on the front and spread the caliper pistons, you should pump the brake pedal 10 or 15 times to move the pistons out. Some ABS systems are notoriously hard to bleed.

Apr 04, 2009 | 1997 Toyota Celica

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