Question about 1985 Yamaha FZ 750 FN (Europe)

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Brake pro OK now my problem: With the system bled, the brakes do not exert much force at all... I can push the bike with the brake lever fully depressed!!! I measured 4.7mm on the brake rotor (I think the absolute minimum in the manual is 4.5mm) I even see the pads pushing against each other, but Im not sure the displacement is sufficient. What could the problem be? How can I be sure that all the air is bled out from the system, or is there a problem in the master cylinder assembly that I am overlooking. BTW I rebuilt the master cylinder assembly seals and everything.

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You probably still have air in the system ... Back to bleeding ! start bleeding from the top down--banjo bolts down to bleeder--then let it sit for a few minutes and take a plastic hammer or a piece of wood and tap on banjo bolts to move air bubbles to top and bleed again.

Posted on Nov 10, 2008

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How to bleed brakes on 2007 crf150r ?

On any bike use a vacuum brake bleeder as the best way, take the brake fluid reservoir cover off and make sure you never let it get empty, ALSO DO NOT OVERFILL IT, open the bleeder screw a little and let the vacuum bleeder such the fluid out until no air bubbles appear and then close it, top up the fluid level as necessary and then squeeze or push the brake actuating lever or pedal to confirm a hard lever or pedal condition. If you are flushing the system first suck all of the fluid from the reservoir and replace it with fresh new fluid from a thereto unopened container of the correct fluid type and then commence the previously set out bleeding process. If you do not have a brake bleeder you would first pump the brake actuating lever or pedal a few times and then holding it in the brake application position you would open the bleeder screw, catching all escaping fluid and then close the bleeder screw before letting the actuating lever or pedal release back to its original position and then you would pump it up again and repeat this procedure until the brakes are properly bled and tested for a solid lever or pedal again etc. as applicable, ALWAYS test the brake operation in a safe, not congested and not busy place at low speed before using higher speeds or going on the road or etc. IF YOU HAVE ABS brakes you will probably need to have the system updated and reset by the manufacturers computer diagnostic and programming system after any bleeding etc processes. DO NOT under any circumstances mix DOT3/DOT4 and DOT 5 brake fluids as they are incompatible with each other and the wrong one in any system will destroy the rubber parts, hoses etc. DOT4 fluid is hygroscopic and should be changed completely at least every two years. It is also very damaging to paints, plastics etc so do not get ANY on anything and if some does get on anything IMMEDIATELY wash it off with lots of clean water. DOT5 fluid is not hygroscopic but manufacturers usually still recommend changing/flushing it at least every two years. REMEMBER that brakes are very important and if you do not fully understand and have the required experience to properly work with them or on them do not do so and leave it to a trained and experienced individual instead.

Jun 10, 2014 | Harley Davidson XL 1200 C Sportster Custom...

1 Answer

Hello I have replaced the clutch plates,the release cylinder seals and rebuilt the clutch master cylinder. There is no leaks and the system has been bled and it feels fine. When I pull the clutch lever in...

Back wheels often move when the lever is pulled in...this is due to hydraulic drag caused by the oil on the clutch plates and is totally normal. You should be able to stop the wheel by hand with the lever in.
With the lever out the clutch is fully engaged and the engine will therefore stall with the brake on...
As long as the wheel rotation can be stopped by hand with the clutch pulled in it's behaving normally...
Rocking the bike in gear is a method that's used to seperate the plates on a clutch that is dragging...usually if it's not been used for a while.

May 06, 2012 | 1987 Yamaha FZR 1000

1 Answer

Rear brake lever doesn't push the brake pads against the rotor. New lines. Bled the brake using pressure, then suction, then using the pedal. Seems to bleed OK, but doesn't work when everything is...

Hi, remove the caliper from the rotor, leaving the brake line conected, now lift the caliper higher than the master cylinder and re bleed the system with it in the higher position, this will force the air out up hill rather than the fluid gravity feeding when you bleed it in the normal position, poor master cylinders on the rear brake, make sure your brake pedal returns fully check it isnt sticking and has some free play

Mar 03, 2011 | 1988 Laverda SFC 1000

2 Answers

ABS flashing on dashboard and very little rear brake on peddal and front brakes are weak. Rear brake light is on fully at all times. Speedo is stable

ABS - Anti-Lock Braking System And EBD -Electronic Brake-force Distribution In Plain English Posted by: Rohit Khurana March 1, 2010 in Automobile Technology
AdvertisementCarBlogIndia Technology Articles , today I will talk of one of the most talked about safety feature called the ABS And EBD. Again I will try to keep the language simple and human understandable (which non-engineers can also make some sense of), pun intended.
What Is ABS ? Anti-Lock braking System system or ABS is a safety system which prevents the wheels on a moving vehicle from locking up(or cease while rotating) while braking. ABS offers improved vehicle control over dry and especially slippery surfaces by reducing the braking distance but it can also increase the braking distance in case of loose surfaces like snow, gravel etc. Ever since the invention of ABS, it has been evolving and the recent systems not only prevent wheel locking but also electronically control the front-to-rear brake bias, which we know as Electronic brake force system, Traction control system, Emergency brake assist or Electronic stability control.
Working Of ABS
When brakes are applied under heavy loads, the braking pressure becomes high resulting in heavy braking or in other words locking up of wheels. The ABS overcomes this by monitoring the wheel speed and releases pressure on each wheel brake lines in the form of rapid pulses switching between different brake lines. which prevent locking-up.

Preventing lock-up under heavy braking helps the driver in maintaining control over the vehicle. In modern ABS an individual brake line is provided for each of the four wheel enabling different braking pressures for different road surfaces of the wheels.
What Is EBD ? Electronic brake- force distribution system also called as Electronic brake-force limitation is an automobile brake technology that automatically varies the amount of force applied to each of a vehicle's brakes, based on road conditions, speed, loading, etc.
EBD system is always coupled with anti-lock brake-force system. The most important function of EBD is to maintain vehicular control with variation in braking pressure applied to each wheel in order to maximize stopping power. Generally most of the weight of all vehicles is carried by the front end so the EBD ensures less braking pressure at the rear end to avoid skidding. But in some EBD's the distribution of braking pressure at the rear end is more initially when the brakes are applied before the effects of weight transfer comes into play.
Working of EBD system An EBD is a subsystem of the abs and its function is to control the effective adhesion utilization by the rear wheels. this definition has been given by SAE in its technical paper no. #920646.
The Antilock brake force system releases pressure in different brake lines at the time of heavy braking to prevent locking-up. The action comes in the form of releasing pressure from the braking circuit when it detects extreme and rapid deceleration in any of the four wheels in order to make sure that the driver maintains control over the steering during panic or emergency braking. For example if the wheels of a vehicle are on snow as well as asphalt then in case of emergency braking the ABS will monitor the speeds and eventually the EBD system will release less pressure for wheels on snow and more pressure for wheels on asphalt to prevent wheel lock-up




Nov 09, 2010 | 2008 BMW R 1200 RT

1 Answer

Spongy Front brakes, braided hoses fitted direct to each caliper from master cylinder, also replaced brake master cylinder seals, bleed them to death, to remove air, pressure remains constant at brake...

try using a line locker close to master cyclinder ,lever should go rock hard if it has no air in system,work line locker down lines to see if lever stays hard.
also check the lever travel to make sure that lever is pushing on master cyclinder plunger as a lot of after market levers dont have correct casting and have to travel in a long way before brakes work even when system is bled. also check to make sure calliper carriers are not bent and pads not sitting square on rotors.
hope this helps

Apr 19, 2010 | 1990 kawasaki ZZR 1100

1 Answer


hi,i am assuming you have no front brakes,bleed the master cylinder before you try the calipers,to do this,simply pump up some brake pressure with the lever,hold the lever against the bar (fully applied)then crack the banjo bolt that holds the brake line onto the master cylinder,you should see air escape,retighten the banjo bolt,repeat the procedure untill all the air is gone,it doesnt take much air to stop the master cylinder working,once you have the master cylinder bled,then rebleed the calipers in the normall fashion,dont forget to put a rag down to protect the paint on your fuel tank,brake fluid loves paint...hope this helps,,cheers

Feb 02, 2010 | 2001 Yamaha YZF-R1

1 Answer

Front brakes works poorly. takes too much effort

This piston may have siezed in the caliper. A little rust, corrosion on the piston can be enough to sieze it especially if the bike is left standing for an extended period.

Aug 31, 2009 | 2002 Yamaha Road Star Silverado

2 Answers

Front braking is lost after changing lever.

the abs module needs to be bled via the hd digital technician 2 software; sorry need to take it to a dealer; can't fully bleed the module w/o it and it may interfere w/ warranty issues later

Mar 20, 2009 | 2008 Harley Davidson FLHX Street Glide

1 Answer

Brake calipers spongy feel

Does all the usual tricks include wrapping a thick bungee cord around the brake lever and leaving it overnight? That should force any residual air bubbles to the top of the system where the master cylinder should replace them with fluid.

If that does not work try installing some new bleed screws, even speed bleeders.

Feb 24, 2009 | 1999 kawasaki ZZR 600

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