Question about 1995 Volvo 850

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Okay when i give my car gas the brake pedal pumps out and gets hard any ideas vacuum leak?

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Check vacuum line/connection from source to brake booster.

Posted on Jun 26, 2009

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4 Answers

Why is it hard to push on the brakes


The most obvious cause for a hard pedal is simply not enough vacuum. Check the brake power booster by pumping on the brake pedal while the car isn't running. Continue pumping until you've "bled off" the vacuum from the booster. Hold the pedal down while you start the car. The pedal should go down a bit more beneath your foot. If it doesn't, then you should examine the connection between the vacuum hose of the brake power and the engine's vacuum.
Replace the brake power booster if the connection's fine, which would fix the hard brake pedal problem.

It may be your calipers need replaced. Check them for signs of wear. Look at the metal spring where the brake pads sit.
Apply tension to the pad and see whether you hear a pop. If you do, the brake pad is moving too much on the bracket. Replace the caliper. This could help the hard brake pedal.

Jul 09, 2014 | 2000 Isuzu Rodeo

2 Answers

Hard brake pedal


You can only have whatever the engine vacuum is
at any time.
Is there vacuum to the booster check valve
& is the valve working,assuming you have the
old one or a new one with the new booster.
Does fluid flow out all 4 corners?
Are the Rubber Flex Hoses Collaped
Calipers Rusted & frozen?
Did you remove the master & clean out
the moisture from around the piston
That is where you start,then flush & on to
every component in the system, if they are
on the vehicle for many years
You do realize brake fluid gets changed every
2 years on all vehicles or you got big problems with
moisture in years to come

Jul 18, 2013 | Cars & Trucks

3 Answers

Are there vacuum hose on the brakes hydraulic system?


NO. the vacuum is used to make the brake pedal easy to push, power brakes. the pedal would be hard without vacuum, that is why the pedal gets hard with the key off and engine not running. the problem you are having is more of a hydraulic problem.
Have the brakes checked asap. the brake system may have a leak causing the pedal to go low. check the fluid level and if it is low or empty then there is a problem, could be a rotted brake line leaking or a wheel cylinder leaking.

Dec 07, 2012 | 1997 Ford Probe

1 Answer

Brake booster appears not to be working properly. brakes work ok for 1 or 2 apps then pedal gets hard. cannot hear any vacume leaks. the car does have a vacume switch in the booster


the booster is the problem, or a hole or leak in vacuum line to booster check the check valve also ! from manifold. heres the symtoms of a bad brake booster. primary symtom is a hard pedal on application, to test booster. pump brakes several times with engine off. to deplete stored vacuum. turn on engine with pushing slightly on brake pedal. you should feel the pedal fade away abit and then become firm. but not hard. if you feel nothing at pedal when engine starts, brake booster is not working! check the vacuum lines first!!

Jun 11, 2011 | 1985 Pontiac 6000

1 Answer

My 2004 prius abs and brake light came on and the the brakes became very hard and constant beeeep noise, so i would shut the car off and pump the breaks and it would work fine so i decided to bleed the...


well, a hard firm pedal, usually indicates a bad brake booster or a vacuum leak to booster or the vacuum check valve, on booster. TO TEST BRAKE BOOSTER; pump brakes several times with engine off to deplete stored vacuum. turn on engine with pushing slightly on pedal. you should feel the pedal fade away a bit and then become firm, but not hard. if you feel nothing at the pedal when engine starts the booster is at fault. good-luck !!

Feb 03, 2011 | 2003 Toyota Prius

1 Answer

Breaks wont pump up no air in line.will pump up when car is not running.start it and hardly no pedal


SOUND LIKE POWER BRAKE BOOSTER FAILURE.CHECK TO SEE IF VACUUM GOING TO POWER BRAKE BOOSTER.IF NO YOU HAVE BROKEN OR DISCONNECTED VACUUM LINE TO BRAKE BOOSTER.IF POWER BRAKE BOOSTER GETTING VACUUM MORE LIKELY BRAKE BOOSTER HAS A LEAKING DIAPHRAM.

Dec 03, 2010 | 1999 Oldsmobile Alero

2 Answers

Have an '88 corolla sedan (manual), after brakes used in quick succession, brake pedal looses all assistance and pedal goes hard, resulting in poor brakes...any ideas


this is probably normal. your power brake booster operates by storing engine vacuum to be used later to assist the brakes. when you pump the pedal repeatedly in a short period, the stored vacuum gets used up and it does not have sufficient time to build up the vacuum needed to effectively assist with braking. it generally takes a few seconds to build up sufficient vacuum from when you let off the brake pedal to when you press it again. however, brake boosters can fail over time (it's not uncommon, but it does happen), so if this is a new development for this vehicle, you may need to replace the brake booster or check the vacuum line and the check-valve between it and the engine

Sep 29, 2009 | 1987 Toyota Corolla 2 Door

1 Answer

1992 toyota corolla, stiff brakes after driving several miles in


remove the master cylinder and check the plunger projection make shore it is with in specs, using a vacuum pump check condition of capsule see if it holds the preasure and its not leaking off. if its leaking change capsule and check valve

Sep 24, 2009 | Toyota Corolla Cars & Trucks

1 Answer

Have to press hard on breaks to break on 528i bmw 2000


sounds like brake booster not working
check vacuum hose that goes to booster is ok and not leaking
engine off
pump up brake pedal several times
hold brake pedal down
start engine
pedal should sink down approx half to 3/4 way down indicating booster is working
if pedal doesnt go down when engine is running booster has leak or no vacuum supply from engine which requires great pedal effort to try and get vehicle to stop.

Jun 26, 2009 | 2000 BMW 5 Series

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