Question about 1991 Volkswagen Golf

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No servo assistance on master brake cylinder golf II 1991

No servo assistance on master brake cylinder golf II automatic 1991 mod

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Make sure your vacuum hose is not leaking and connected properly.

Posted on May 25, 2010

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Posted on Jan 02, 2017

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I have bus man lions coch year 2004.problem is edc 00637-01 wat is it


anti clock brakes either a sensor is faulty or you have air in the lines bad fluid {old} a master brake cylinder or its servo cycliders and or some ec {controller} connection is wrong in a bus i would expect a servo at each drum and a master cylinder does the air come up too speed when the engine starts ie does the pig cylinder charge and when charged bleed its self to regulate the brake preasure i think its a sensor thats bad on one of the brake servos at the hubs ...

Oct 18, 2014 | Cars & Trucks

1 Answer

1990 jeep wrangler bleeding breaks


Hi there:
I suggest to check this procedure, when the hydraulic brake system must be bled whenever a fluid line has been disconnected because air gets into the system.

A leak in the system may sometimes be indicated by a spongy brake pedal. Air trapped in the system is compressible and does not permit the pressure applied to the brake pedal to be transmitted solidly through the brakes. The system must be absolutely free from air at all times. If the master cylinder has been overhauled or a new cylinder has been installed, bleed the cylinder on a bench before installation. When bleeding brakes, bleed at the wheel most distant from the master cylinder first, the next most distant second, and so on. During the bleeding operation the master cylinder must be kept at least 3 / 4 full of brake fluid.


The ABS bleeding procedure is different from the conventional method. It consists of the following three steps:
Step 1: Conventional manual brake bleed.
Step 2: Bleeding the system using the DRB scan tool.
Step 3: An additional conventional manual brake bleed.

The recommended ABS bleeding procedure is as follows:
  1. To bleed the brakes, first carefully clean all dirt from around the master cylinder filler cap. Remove the filler cap and fill the master cylinder with DOT 3 brake fluid to the lower edge of the filler neck.
  2. Bleed the master cylinder first. Have a helper operate the brake pedal while bleeding each master cylinder fluid outlet line. Do not allow the master cylinder to to run out of fluid,as this will allow additional air to be drawn into the cylinder.
  3. Bleed the brake system in the following sequence:
    1. Master cylinder
    2. HCU valve body (at fluid lines)
    3. Right rear wheel
    4. Left rear wheel
    5. Right front wheel
    6. Left front wheel
  4. Clean off the bleeder connections at all four wheel cylinders. Attach the bleeder hose to the right rear wheel cylinder bleeder screw and place the end of the tube in a glass jar, submerged in brake fluid.
  5. Open the bleeder valve 1/2 - 3/4 of a turn.
  6. Have an assistant depress the brake pedal slowly and allow it to return. Continue this pumping action to force any air out of the system. When bubbles cease to appear at the end of the bleeder hose, close the bleeder valve and remove the hose.
  7. Check the level of fluid in the master cylinder reservoir and replenish as necessary.
  8. After the bleeding operation at each wheel cylinder has been completed, fill the master cylinder reservoir and replace the filler plug.

Do not reuse the fluid which has been removed from the lines through the bleeding process because it contains air bubbles and dirt.


  1. Perform the "Bleed Brake'' procedure with the DRB II scan tool. This procedure is described in the DRB II software information and diagnostic guide.
    1. Attach the DRB II scan tool to the diagnostic connector.
    2. Run the Bleed Brake procedure as described in the DRB II tester guide.
  2. Repeat the conventional bleeding procedure as previously outlined.
  3. Fill the master cylinder reservoir to the proper level.
  4. Check the brake operation.


Hope this helps.

Apr 21, 2013 | Jeep Wrangler Cars & Trucks

1 Answer

Loing brake fluid


go by the brakes master cylinder which is connected on to the Servo and confirm by removing the bolts holding the master and pulling it slowly slowly forward by not disconnecting anything and see whether inside the servo is a brake fluid . I believe surely you will find fluid there in which is asking you either to repair the master cylinder or renew it.

Aug 18, 2012 | 2003 GMC Sierra 1500

1 Answer

My brakes do not go off when I release the brake. They do go off when I turn off the car.


There seems a vacuum /air lock in the servo and must be checked in the master cylinder unit.
With the car engine running have the pedal kicked while you release the assist to the servo unit , if so the master cylinder must be overhauled .

Sep 29, 2010 | 2000 Ford Focus

1 Answer

Front brakes only stick when engine is warm


either the servo push rod is over adjusted ,or teh rear seal in the servo is leting air in without the brake being applied

Apr 30, 2010 | 1991 Volkswagen Golf

1 Answer

My 1992 cavalier shakes while idleing in gear with foot on break but stops while in motion or idleing in park?


hi from uk the symptoms you clearly describe sound like your brake servo /vacuum cylinder is at fault ie whilst brake pedal is off all is ok ? but when pedal pressed engine falters? this is a sign that the seal on the vac piston inside the servo unit is allowing air /atmospheric air to enter the servo as you brake and this assists braking however when inner pistonseal is leaking at some point inside the servo bore ie a scoared or rusty point ?the atmospheric air passes the piston/seal and so the vacuumpipe to servo is drawing this air into inlet manifold resulting in upsetting fuel mixture ie weak too much air ratio to fuel resulting inshaking engine you describe ? try this?? if you disconnect vac pipe from servo unit then seal off the pipe with thumb then ask assistant to start engine then it should run ok ? also it should be ok when b/pedal pressed remember there will be no vac assistance ?? if above test prove right ? then you will req a new servo unit only not complete master cylinder too ? you can diy this then bleed brakes after replacing servo ? hope this helps

Feb 27, 2010 | 1992 Chevrolet Cavalier

2 Answers

HOW TO INSTALL BRAKE MASTER CYLINDER TO VOLVO S40


brake master cylinder is mounted on brake servo under bonnet . remove the metal brake pipes going to it remove 2 nuts holding it to servo remove from car fit new one fill with brake fluid dont connect pipes yet have assistant pump pedal when fluid flows out of all ports on cyl get assistant to hold pedal down now fif pipes and secure try pedal if it feels firm job done if not you willneed to bleed the whole system

Feb 06, 2010 | 2001 Volvo S40

1 Answer

My 1996 Espace has had 3 new master cylinders in the last 9 months also 3 new wheel cylinders.each time it worked for a while but then brakes go soft again and i mean nothing no brakes at all, so i had a...


the brake system is a duel system if you are loosing complete brake failure that points to the master cyl. but a faulty servo can damage the seals in the master cyl.if the diaphram is leaking. pull one of the old master cylinders see if the seals have been partially been turned inside/out if its the front brakes full of air sounds like the primary circuit master cyl piston/seal closest to the servo if it was me i would change that servo

Apr 27, 2017 | 2001 Renault Sportwagon

1 Answer

Does a 95 isuzu trooper have hyd brakes?


yes...just about every car has hydraulic brakes....brake fluid is put under pressure by the master cylinder when the pedal is applied.....this in turn applies pressure to the brake pistons at the wheels...if you mean " are the brakes servo assisted "..then yes

Jul 27, 2009 | 1995 Isuzu Trooper

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