주요 콘텐츠로 건너뛰기

The 5th generation BMW 3 Series is based on the E9X platform. The car pictured is a E90 chassis. The E9X chassis was used from 2004-2013 when the F1X chassis was released. When talking about a non-specific chassis, this generation is typically referred to as the E9X chassis since there are multiple chassis for this generation of 3 series, depending on the body style (E90/E91/E92/E93).

28 질문 전체 보기

Brake Pedal becomes rock hard sometimes.

2010 BMW 320i

Following recent replacement of Rocker Cover and Gasket by BMW, the Brake Pedal sometimes becomes rock hard after the engine is not working for a number of hours. What is the problem?

답변되었습니다! 답변 보기 저도 같은 문제를 겪고 있습니다

좋은 질문 입니까?

점수 4
댓글 1개

Vaccum pump is new. But de break is hard

댓글 달기

답변 5개

선택된 답변

Hi,

Check if the vacuum brake pump is connected properly or is even working

Park the car and turn off the engine.

Pump the brake pedal five or six times

Start the engine, and keep your foot pushing down on the pedal. Check what happens to the pedal.

With the engine running, the engine sucks the air out of the brake booster, restoring the vacuum. Normally, the pedal will drop towards the floor with your foot applying light and steady pressure on it.

If the pedal pushes back against your foot, then there is a problem. This could be a blocked vacuum hose, a leak in the vacuum hose, or a leak in the brake booster check valve.

Given that it happens after the engine has been idle for some time, inspect the check valve for leaks.

해당 답변은 도움이 되었습니까?

점수 4
댓글 달기

pythagorasgp , This is what a lot of the BMW forums are saying, Very common issue, the culprit is usually a leaking check valve. I also found a good link for you to read through that goes in depth of the issue even from earlier models.

http://www.e90post.com/forums/showthread...

해당 답변은 도움이 되었습니까?

점수 2
댓글 달기

If it's very cold by you, sometimes ice can develop in the hose supplying vacuum to the brake booster (or check valve). The water could possibly entered the system during your recent service. Just a possibility.

해당 답변은 도움이 되었습니까?

점수 0
댓글 달기

Most of the car's brakes are assisted by vacuum. If you pump the brakes off your car, you get to find a normal pump, and they in due course of time hardens as the vacuum reservoir gets exhausted. Now if your car is being used for weeks together, the vacuum might recede as the system isn't designed to hold the vacuum for long, and that’s why you tend to get the hard pedal feel. You can test this hypothesis easily by turning off the car and pumping the brakes.

The probable reasons and frequent solutions to get rid of the hard brake pedal are:

Vacuum or lack of vacuum pressure is the most common cause of a hard brake pedal, and therefore, it is the foremost thing to look at when the brake pedal becomes rock hard. Another possible reason for a hard pedal could be the combination valve and in particular the Pressure Differential Valve within it. A thorough inspection of the whole system should help you identify such underlying issues of a hard brake pedal.

If you are completely unaware and do not know how to take the correct action, engage a professional mechanic at Eurobahn BMW MINI Mercedes-Benz Audi of Greensboro.

해당 답변은 도움이 되었습니까?

점수 0

댓글 3개:

Could putting on new breaks and caliper-Core be the reason why my breaks are hard ?

Do they just need breaking in

Could the lack of vacuum also prevent the egr valve correctly opening and cause an insufficient flow code?

댓글 달기

I had spongey brakes and had replaced booster. rotors and all brake pads. I tested brakes and heard a click and felt a slight click in pedal, this only happened once when pumping the brakes after replacing new parts. I bought new master brake cylinder and tested brakes again. brake pedal stiff and brakes do not release until i bled one brake caliper and or unplugged the vacuum hose on booster, then the brakes released. went back and forth trying to find any issues, bled the ABS valve, still stiff brakes with no release. The remedy/FIX ... I compared the center pin with the old booster pin, ( on the booster that plunges into the master cylinder ) and the new booster pin was 1/16th an inch longer. I swapped out new pin with the old one. brakes work great as they should. Hope this helps someone else with this kind of issue, PEACE

해당 답변은 도움이 되었습니까?

점수 0
댓글 달기

귀하의 답변을 추가하세요

pythagorasgp 님은 대단히 고마워 할 것입니다.
조회 통계:

24 시간 전: 9

7일 전: 60

30일 전: 195

전체 시간: 102,657