I was driving today and on the way one everytime I braked lightly the pedal will slowly fall to the floor. If I brake hard I have good pressure on the pedal. The weird thing is everytime I let go of the brake and the brake travels up, I hear a slight thump and the brake pressure is back to normal untill I press on it slightly again. Then it goes back down to the floor. Is this my master cylinder thats fubar or the brake booster?

 

yes its definetely you master brake cylinder, go have it changed

 

I second the master cylinder.
The booster failing would not allow the pedal to travel to the floor.

 

Is it possible to do on my own or let the professionals handle it?

 

by your tone i would say take it to a shop, but i have no clue how hard it is but its not something i would do

 

If you have to ask the question, no offense, you should consider taking it to a shop.
Otherwise, if you have time and place to do the work, invest in a Helms shop manual and some tools, and you will thank yourself in the long run.
Good luck......and let us know how it all turns out.

 

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how sure are you on this issue man...cuz my dad's accord got the same problem....which is not cool....

 

First check for any leaks in the brake system. If there are no leaks
present, then I would try bleeding the system. Did you have any brake
work done recently? If your pedal is still low, then I would go after the
master cylinder.

 

master cylinder its not that hard but ull proable have to bleed the brakes this takes 2 people

 

I'll see whats up. My friend and I will probably do this. I'll let you guys know whats going on. I used to have this problem awhile ago and it didnt happen as often. Now is happening all the time.

 

Master Cylinder, i just changed mine myself, its easy just dont **** up the little bolt things that hold the lines in, then grab a friend and bleed the brakes, took me about 25 minutes and 25$

 

i gotta say, it's one of the easiest things i've ever done.

 

and yes, brake pedal going to the floor means change your master cylinder ASAP. It is going to fail if you don't.

 

Don't forget to bench bleed the M/C too, otherwise it will take forever to bleed them.

 

how much to fix master cyclinder?

 

like 60 bucks,

do it yourself.

 

Fixed it myself. Looked to be contamination. I think the previous owner poured some oil in the Master Cylinder... Contamination caused seals to get damaged. Bought the master cylinder for around $75. About an hours with of work. Wasnt that hard at all.

 

**** son that's sweet.

you ******* owned that problem


I'm glad when I see people actually stepping up and doing **** when it needs done instead of whining and then doing nothing. MAD PROPS

 

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Yea that's some good ish... I remember fixing the MC was one of the first things I learned how to do. Now I get that feeling of "accomplishment" every time I hit my brakes.

 

Not to be a cause for further worry, but if a petroleum based liquid (such as oil, etc.) was poured into your master cylinder, it will not only cause the MC seals to fail, but also the piston seals in your calipers to fail. Just something to consider.

 

your master cylinder needs to be replaced..

this happend to me but with my clutch... it scared the **** out of me..