Question about 2004 Chevrolet Aveo

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Brake master cylinder location. Stiff brakes first thing in the morning

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  • Chevrolet Master
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Master cylinder is in the engine compartment on the firewall in front of the driver seat. Stiff brakes do not indicate a bad master cylinder, but could indicate the booster. Listen for vacuum leak at the booster with engine running. The booster is a big donut shaped thing behind the master cylinder.

Posted on Aug 29, 2010

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Posted on Jan 02, 2017

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Is it hard to change out the master Brake cylinder ore is it beter to reper it on a Toyota Rav4


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No braking assist, rushing sound (air escaping)wheng brake pedal applied.


HI this sounds like the vacuum booster has a leak in the diaphragm. That is why you hear that sound when you push on the brake pedal. With out the vacuum to help this leaves you with a very stiff brake pedal. You will need to replace the Booster which is located behind the brake master cylinder and on the firewall. Good luck

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I am using a company van, a 2006 e-350 super duty ford van and the brakes are very stiff. Do they have a fuse for the braking system and, if so, which location would it be in?


The brake booster is a vacuum operated mechanism that is obviously failing on your van. It's the big round device that your master cylinder and bolted to (mastyer cylinder is directly under the brake fluid reseviour). Check the vacuum lines for leaks. If not, most times the master cylinder has been bad and leaking fluid into the booster which will damage it.

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I think I need to replace my brake booster.


Did you bench bleed the master before you installed it???? Engine off, have someone push the brake petal down and hold it down while you crack the brake line loose at the master,then tighten it and let up on the petal.Do this several times for each of the 2 lines at the master, only cracking it when the petal is being held all the way down.Repeat...Do them separately.Have some rags below the master to mop up the mess and keep the master from running out of fluid. Then do the gravity bleed one more time on each wheel cyl. and watch for a bubble of 2.
I hope this helps you.
Yes the booster sounds fine.

Sep 22, 2009 | Chevrolet El Camino Cars & Trucks

1 Answer

The brakes on my 1992 dodge ram 250 4wd will only brake when you press them down real hard, they are quite stiff, do you know what might be wrong and the solution for it?


Thats the brake booster.Its located behind the master cylinder on top of the fire wall.In the engine compartment on other side of steering wheel

Jul 12, 2009 | 1992 Dodge Ram 250

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2005 f150 spongy brakes


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Mar 24, 2009 | 2005 Ford F-150

1 Answer

94 s 10 jimmy 4wd vortec brakes stiffen up sometimes unexpectedly and the pedal refuses to go down... any advice?


when brakes get stiff can you push down with both legs to get brakes to work? 3 things check vacuum line to brake booster. Brake booster may be about to fail. Replace brake booster and master cylinder.

Mar 15, 2009 | 1994 Chevrolet S-10 Blazer

1 Answer

Brakes freeze?


You seem to need a Brake booster. You master cylinder is mounted to the brake booster. You will need to remove the master cylinder and then loosen the (4) bolts under, up above the brak pedal. nThere should be a rod coming from the booster that connected to the brake pedal. Remove the cotter pin or clip and remove rod from top of brake pedal. Then release the (4) bolts holding booster and you should be able to get it out. Replace in the opposite way. Good luck

Dec 08, 2008 | 1999 Subaru Legacy

1 Answer

Brake pedal stiffens sometimes when braking and prakes dont work properly


you could have a leak in the vacuum hose that is attached to your master cylinder.

the brake master cylinder is aided by a vacuum coming from the engine, if the engine dies, the brake is stiff as well as if the hose is damaged, it is just like the engine dies also.

check your brake master cylinder and trace the big black hose attached to it going to the engine,

inspect for cracks or damaged or leaks.

replace if necessary.

tnx 4 using fixya,

drcool

Sep 16, 2008 | Hyundai Accent Cars & Trucks

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