Question about 1978 BMW R 60-7

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Repair brake master cylinder

Brake master cylinder leaking. piston needs new seal. how is it replaced?

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Remove from handelbars. take handel off of master and set it down. take compressed air to the opening of the brake line and get a good press with air blower. piston and seal should come rightout. replacing is very simple if not sure just follow dirtections in the pack.

Posted on Oct 08, 2009

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Posted on Jan 02, 2017

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580m brake pedal goes to the floor. No brake on right side.No visible hydraulicleak. Where do I look for problem?


Internal master cylinder leak. Piston seals in the master cylinder are the most probable cause. Master cylinder needs replacement if no other leaks found.

Feb 25, 2017 | Cars & Trucks

3 Answers

Brake fluid leak on rear drum


If you have no evidence of leaking outside the drum, most likely your brake piston is leaking or the drive shaft seal is leaking. Pull off the drum and look for the piston which spreads the two brake pads normally situated at the top. Inspect for leaks. If the fluid is thin, it is most likely brake fluid. If it is heavier like oil and really stinks, it is gear oil from a leaking seal.

Sep 07, 2012 | Cars & Trucks

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Nkr 200 1991 brake alarm sounds low brake pressure


are you loosing brake fluid? do you notice any leaks? it could be a bad master cylinder or a bad proportioning valve, master cylinder is more common failure.

Jun 09, 2012 | Cars & Trucks

2 Answers

I have a ford f150 that i have redone the brakes but all i getting is a brake pedal and then goes to floor


Bleed your brakes, starting with Right rear, left rear, right front and ending with left front. You have air in the lines or a bad master cylinder. Bleeding is the cheaper of two options.

Mar 10, 2011 | Ford F-150 Cars & Trucks

1 Answer

Leaking brake fluid at the clutch pedal?


You have a leaky clutch master cylinder, or a leaky brake master cylinder.

The fix to to find out which one is leaking and to replace it. The new fluid will need bleeding out at the slave cylinder, but first pull back the rubber boot on the end of the slave cylinder (assuming it's the clutch). If there is fluid there as well, the the slave cylinder must also be replaced. if it's the break master cylinder, then you'll need to check the seals on the rear wheel brake cylinders and the front wheel caliper pistons. If any leak, they must be replaced.

If you're an experienced mechanic (your question suggests not) then you may be able to dismantle, assess, and if appropriate rebuild any leaky parts using new seals/pistons. The parts are usually cheap, but the very high labour costs and higher chances of a post-repair fault mean that most garages just replace the entire assembly with new and guaranteed parts as it's far quicker, easier and less likely to come back for remedial work.

Feb 16, 2011 | 1994 Ford Escort

2 Answers

Brake fluid is leaking out around my brake pedal


you have a bad break master cylinder seal. replace master cylinder unless you have the expeirence to rebuild master cylinder

Jan 22, 2011 | 1990 Geo Prizm

1 Answer

Brake fluid is expelled from the top cover of master cylinder when brake pedal is depressed why?


Brake fluid from the Master Cylinder leaks if the Master Cylinder is leaking itself otherwise the leak is somewhere else, have some one check this out, it could be anywhere and you should have seen some drops on the floor by now.

Sounds like a "stuck" caliper piston. Many Chrysler products (by example) used "phenolic" pistons in the calipers which were notorious for seizing in the caliper. Replacement pistons are usually made of steel. With the piston seized heat builds up and ruins the seals in the caliper.

You could have a blown master cylinder that is leaking from the back and into the booster area. Take the cylinder loose from the booster and see if there is fluid in that cavity. Sounds like a massive leak. Look at the rubber hoses and metal lines. The reason you cannot pump up the brakes is because the leak is allowing air to re-enter the system so that pressure cannot build up.

Also, this article could help to check it: how-to-fix-a-brake-fluid-leak

I hope helps (remember to rate and comment this).

Oct 03, 2010 | GMC Sierra 1500 Cars & Trucks

3 Answers

I have a slow brake fluid loss. I think it may from the master cylinder. Are there any seals in the lines that go into the master cylinder unit.


no they are inverted flare fittings no seals check all lines and calipers/wheel cylinders if all are dry remove the vacuum hose from the booster if there is brake fluid in the hose the master cylinder is bad

Sep 24, 2009 | 2002 Hyundai Santa Fe

1 Answer

Power assist leaking between master cylinder


If it is leaking fluid between the booster and the master cylinder, you need a new master cylinder. If it is leaking vacuum when you push the brake pedal, you need a new booster and master cylinder.

Jul 15, 2009 | 2001 Chevrolet Silverado 1500

2 Answers

Clutch or master problem?


CHECK FOR ANY LEAKS STARTING AT MASTER CYLINDER THEN CHECK SLAVE CYLINDER AT G/BOX IF OK THEN BLEED CLUTCH MASTER CYLINDER OR SLAVE CYLINDER MIGHT HAVE WORN SEALS IN THEM THOUGH SO PARTS MIGHT NEED REPLACED.

Dec 16, 2008 | 1993 Nissan 240SX

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