Question about Harley Davidson FXDWG Dyna Wide Glide Motorcycles

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Lose brake pressure

I have no front brake preasure.i replaced mastercylender,and brake line still nothing

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  • Harley Davidson Master
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Hi Anonymous, please visit websites below:
Bleeding Brakes on your Harley Davidson
Fixing Soft Brakes Issues
Good luck

Posted on May 07, 2015

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Posted on Jan 02, 2017

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strech3030us
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SOURCE: new master cylinder and brake line on 2002 wide glide no brake preasure wheel turnes no brake preasure what next

First thing, is the bleeder valve on the caliper at the wheel in the high position?
If it's on the lower part of the caliper, air will be trapped above it.
Sometimes, a brake vacuum bleeder works better than the traditional way:

http://www.harborfreight.com/brake-bleeder-and-vacuum-pump-kit-69328.html

After bleeding all the air you can, leave it overnight with the pedal/lever (you didn't state if the front or rear brake) tywrapped in the ON position overnight.

IF it's the rear brake, make sure there's a slight amount of play before the rod to the pedal engages the master cylinder piston (if not, it won't allow the piston to fully return).

Posted on Jan 01, 2014

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1 Answer

Hydraulic brakes stoped working after blown steering seel? Need help


If there's no pressure on your brake pedal it's due to a failure somewhere in the braking system. I can't see any connection between a steering problem and a braking problem.

Most cars have a split-circuit braking system. That is, the front left wheel is on the same line as the rear right wheel. The front right wheel is on the same line as the rear left wheel.

This is just a safety feature: If one brake line loses pressure, the other line still works and you retain 50% of your braking power.

check the level of your brake fluid. If the level has dropped it indicates a leak somewhere. Though be aware that it is possible NOT to lose brake fluid whilst having soft brakes..

Brake pressure is lost due to either a faulty brake master cylinder or a leak at one of the wheels.

Remove each tyre in turn and inspect the piston on the brake calliper. If there's slight wetness caused by brake fluid that indicates a seal (around the brake piston) has failed and is drawing in air.

There's no need to replace a calliper - overhaul kits are available.

The link below shows generic images of brake calliper pistons/seals:
brake calliper piston Google Search

Feb 08, 2017 | Cars & Trucks

2 Answers

Brake system failure


I think brake proportional Valve (or Brake pressure regulator) which usually a part of Master cylinder is suspicious.
It regulates pressure to Front and Rear brake line.

If I were you, I try to draw air from Master-cylinder side (not Caliper side).
(Bleed from connector between Master-cylinder and pipe, same way as caliper. someone keep pushing brake then you lose connector then tight. Don't forget to put towel under master cylinder to catch brake fluid)
If air trapped in Proportional valve (pressure regulator), pressure won't relay to rear brake line but only front side.
Front has two separate line from master cylinder (right and left) but rear goes in one line from master cylinder then separate at rear.

Did you noticed both rear brake dragged when it's hot day ?
Because when air get hot, air expand and pushes to caliper and drag but not respond to your pedal.
(calipers don't respond when you push pedal, but it's pushes calipers by itself even you are not pushing pedal, when it's hot because air expand)
Sometimes, seal get old and lose pressure for only one side (front or rear).

if this happened after you did brake job, or you notice your brake was vapor locked (too much brake on hot day then brake fluid boiled), maybe air bleed and whole fluid change may solve.
if you didn't have any unusual activity but it gradually losing pressure to rear, I suspect master cylinder (proportional valve seal).

Sorry I don't have exact e46 master cylinder diagram but basic diagram, hope you can understand what I am talking about.
Picture shows "leak" but this case "Air" in somewhere in pink.
or lose seal on rear piston.

25989474-goldldc3aki35lcvobofcxjr-2-0.gif

Dec 02, 2015 | Halonet 99-05 BMW E46 3-SERIES 2/4/5DR,...

2 Answers

Replaced some brake line, rear pads and one rear wheel cylinder. Now no pressure and nothing happening when trying to bleed.


Does the car have ABS ? And does it have an equalizer block for the 4 wheels ?
It sounds like the ABS has been affected, or there is an equalizer block that is stuck on the front wheels only.
Can you open the bleeder or the rear line on the master cyl and get fluid to come out by depressing the pedal ?

Jul 07, 2013 | 1997 Mercury Tracer

1 Answer

The brakes on my 02 limited keep giving out. If you apply slow pressure to the brakes the pedal will go all the way to the floor and the vehicle slows down slowly, sounds like the abs is working on the...


check to see if your loseing fluid if so then you have a bad break line if not it might be the break booster wich is behined the mastercylender or you could have air in the brake lines but it does sound like the brake booster

Nov 25, 2012 | 2002 Jeep Grand Cherokee

1 Answer

88 t-bird non abs. the front brakes drag. i have replaced all rubber lines also new master cyl. new front brake calipers. rear brake hose preasure will bleed of after it has set for 15 to 20 min.can...


This is bizarre... I'm suspecting dirt in line(s). Are you bleeding correctly? Starting w/ Right rear, left rear, right front, then left front. You might try using a power bleeder also. A possible long shot, is brake proportioning valve sticking.

Mar 21, 2011 | Ford Thunderbird Cars & Trucks

2 Answers

Brakes go to the floor after the brake pads were just replaced 4 months ago


pads likely have no bearing on your problem, If cylender is full of fluid? your mastercylender is a failed part

Jun 10, 2010 | 1991 Dodge Dynasty

1 Answer

Front brakes no preasure ??


Sounds like air in the master cylinder, bleed the front brakes till there is no air and try them. If there is still no pressure then more then likely, you need to replace the master.

May 02, 2009 | 1996 Suzuki VS 1400 Intruder

1 Answer

I took my 84 yamaha maxim out from winter storage 2 weeks ago and when i applied the front brakes they gradually became stuck to the point that they won't release now...any thoughts on why this might be?


WATER/MOISTRE IN MASTERCYLENDER.
NEED TO CLEAN COMPLETE HYDRO. SYST.INCLUDING CALIPERS.AND POSS. REPLACE BRAKE LINES IN ORG.OEM ARE STILL ON IT AFTER ALL THES YEARS.

Apr 30, 2009 | 1984 Yamaha XJ 600

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