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Posted on May 17, 2012
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Brake pedal hard 1988 300c mercedes

Occasionally the pedals becomes hard to press, then is normal again

1 Answer

Domagoj Car

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  • Expert 106 Answers
  • Posted on May 17, 2012
Domagoj Car
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Joined: Sep 21, 2011
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If it is hard upon starting that is normal, if varies from hard to soft and vice versa when driving it could be air in brake system (faulty cilinder or gasket)

5 Related Answers

emissionwiz

Marvin

  • 85242 Answers
  • Posted on Jan 14, 2009

SOURCE: hard start

have u done a fuel pump pressure leakdown test? if not do one, the fuel pressure must stay within 5 PSI of the pressure at engine shut down for 24 hours, if it leaks down u will get a hard start and long cranking times, I suspect this is the problem but do the test, u will need a fuel pressure test guage (avail from Kragen auto), the test port is on the tiop of th engine in the fuel supply rail to the fuel injectors, looks like a metal tire valve.

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Anonymous

  • 1 Answer
  • Posted on Apr 01, 2009

SOURCE: 2005 Mercedes E-Class brake HUMMIMG noise

hi there, sadly there is no solution for this problem and is very common on the e-class as mine does it aswell. There was a big recall on the sbc units on the early w211 model up to 05 i think. The good news is that there is a 10 year warranty unlimited milage, so take it to the local dealer incase it might be faulty.

Anonymous

  • 9 Answers
  • Posted on Sep 29, 2009

SOURCE: 2006 Mercedes-Benz CLK 350. Sometimes runs to

Check the pole/cord going to your gas pedel..u may have to take up the carpet.. but it could be a bearing in the pedel..

marley mcelhinney

  • 490 Answers
  • Posted on Jan 14, 2010

SOURCE: My vehicle, mercedes Benz ,124, 1989 manual's

sounds like the clutch fluid resivior is bone dry or you have a spilt or leak in the line wich is allowing all the pressure to escape hence the pedal not moving back up, start by checking your clutch fluid level

Anonymous

  • 1 Answer
  • Posted on Jan 30, 2010

SOURCE: Possible faulty SAM system for rear lights

not a faulty rear sam more likely a poor bulb holder clean the area that the bulb sits in

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1helpful
1answer

1975 Ford F350 360 Engine the brake pedal stop 2 Inches from the floor is that good pedal?

Your better off going by the feel of the pedal rather than measurements. Try this. With the engine off and the brake system cold remove the key from the ignition and pump the brake pedal. it should get progressively harder and your foot travels a shorter and shorter distance until its too hard to press.
Press and hold the brake pedal hard down then start the engine. You should feel the pedal soften, that's the vacuum inside the brake booster kicking in.
Release the pedal and again press it hard down, holding it there. The pedal should feel firm and not change. Release and repeat to make sure.
If the pedal has no resistance check your work as there is no pressure in the system. If the pedal is soft or spongey re-bleed the system starting with the calliper furthest away from the reservoir.
0helpful
1answer

When I stomp on my brakes let's say in an emergency the pedal is very hard and the brakes don't realy work at all but if I use them normally they are perfect it's on a ford au xr6 ute

to test your brake assist is working. stop the motor. Press w few times the brakes, till the pedal feels sturdy. Then while pressing the pedal down firmly, start the engine. When you feel the pedal going down, like feeling "soft" you know the brake assist works. If nothing changes it is defect.
1helpful
2answers

Brake lights don't come on when pedal is pressed, all other lights work. What could be the cause?

While I'm not overly familiar with Mercedes, I'd assume that it still has a brake light switch located on the bar of the brake pedal itself. This switch is typically just a "plunger" style switch, where when you push the pedal down as if applying the brakes, the plunger extends outward turning the brake lights on. When the pedal is released, as if letting off the brakes, the plunger is depressed causing the lights to shut off. If that plunger gets stuck in a depressed position, the lights will remain off at all times. Check that first, along with the brake light fuse and/or relay. Good luck.
2helpful
2answers

Why is it so hard to apply brake pedal?

_______power brake booster, check vacuum to booster and the check valve for brake booster. primary symtom is high hard pedal that requires greater then normal pedal pressure to stop car. testing booster= pump brakes several times with engine off to deplete stored vacuum. turn on engine with pushing slightly on brake pedal. you should be able to feel the pedal fade away a bit, and then become firm. But not hard. if you feel nothing at the pedal when engine starts. Brake booster is not working. Good-day! make sure vacuum is going to booster with engine running. it may just be a bad vacuum line or check valve.
0helpful
1answer

Rolls Royce Shadow 1 brakes fade then come back after a few hours

Firstly you should change your brake fluid then bleed the brakes and check for leaks if the fluid is old it could get hot or boil through use and cause bubbles which will compress when you press the pedal but when it cools down again it will feel “ normal” again
0helpful
1answer

I drive a kia sportage 2007. When I press brake pedal twice or three especially when driving slowly, the pedal becomes stiff and the brakes seems to lock and car literally stops. However when i pump the...

Your problem is half normal actually. Pumping the brakes will build more pressure in the system and will make the pedal harder and the brakes will brake alot more, the brakes are designes this way. But if the brakes don't release after you let go of the pedal, that's not normal. If this is the case, there may be a few things that can be faulty, but i'd start by checking/replacing brake vacuum booster unit. If the unit is ok, then probably one of the calipers on the brakes are starting to jam due to rust and dirt, especially if you see the the rubber seals on the caliper pistons are damaged or missing.
0helpful
1answer

Brake pedal feel (pedal nearly hitting the floor) brake have been bleed and serviced if you press the pedal once they feel chap --- then press them again the brakes feel great the abs is working ok

I would bleed the brakes one more time to make sure, and also ensure that the brake fluid is full. But it sounds like your power booster is giving you trouble. That is the round cylinder that is attached to your master cylinder.
0helpful
1answer

1992 F250 460 cid automatic 2w drive 85000 mi. Just replaced my master cylinder, all 4 brakes, and both front rotors. Afterward I blead the brakes and got bubbles out of fluid. Problem is : when not...

There is never a test or reason to pump your brakes

Accomplishes absolutely nothing.

There is no pressure in a braking system at all,
until you SLOWLY apply the brake pedal.

Then less than 1" off movement in the master cyl,
will develop 600 to 1800 lbs at the wheels

Release the brake pedal, the system goes to zero,
IT DOES NOT HOLD ANY PRESSURE

To answer your question

You not suppost to press the pedal hard
The saying goes--you apply the brakes,
not force the pedal arm and pin into the
vacuum booster, as though you want to damage it

When your driving what happens ?
You have higher manifold vacuum and
thus your pedal is normal,why the VACUUM
brake booster

0helpful
1answer

I have a peugeot 307 and the brakes have become very hard to press and feel like there is something under the pedal when you press down on the pedal.what could this be

It sounds like the booster is failing. That is the big round thing attached to the Brake master cylinder. This assists the brake pedal so u dont have to press hard. Try another car and press the brake without it running then start it and press it with it running it will feel softer when running. If yours feels like the car when it is not running it is probably the booster that needs replacing on your car. Good luck
7helpful
1answer

99 ford expedition, abs light stays on, front brakes seem to be dragging

When was the last time you changed the front brake pads?
Try this:
Keep the brake pedal pressed down and start the car, after it idles for about 10 second let go of the pedal. If the light comes on just as you leave the pedal - try pumping it a few times, turn the car off and pump the pedal some more until it becomes real hard.
Then, keeping your foot to the pedal, start the car.
Idle for about 10 seconds, let go of the pedal and press it again rel fast.
If the light doesnt come on again - it means you have a leak of some sort or that the main brake pump should be replaced.

Good luck.
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