brake pedal to the floor?

T

TegraTegra

New member
Hi MR,hope you're all enjoying the beautiful weather!

So I've come across a brake issue.Today I decided to clean/lube my brakes,only the front brakes were done.When I finished I didn't think to try the brakes,I figured they were working fine(prior to working on the brakes everything was tiptop) and about an hour ago I go to drive my car. I get in and pump the brakes to build the pressure,then I start the car and the pedal go straight to the floor.

Weird?

I decide to bleed the brakes,thinking that's the issue,when I remove the caliper brake fluid starts to slowly flow out(2 piece caliper) so maybe air got in.I bleed all 4 just to make sure,the passenger side had the most air in it.I get back into the car and it's the same shit,pedal goes right to the floor there is no pressure whatsoever.

Any suggestions as to what it could be?Brake booster?master cylinder? Again,the car was braking perfectly before all this. And there seems to be no leak.

Thank you!!
 
TegraTegra said:
when I remove the caliper
Click to expand...

what? what do you mean by remove the caliper?

what exacly did you do to clean the brakes? did you remove the brake line fittings from any of the calipers by any chance?

Are you bleeding the brakes from the bleeder screw ?

Image for reference :

M109R_FrontBrakeLines_21.JPG
 
Okay so the fluid is topped off,it never got low enough to get air into the system.I was constantly checking it and topping it off.

The brakes are brembo's,so you can split the caliper in 2 by removing 4 bolts and it separates.I did not touch anything else besides the caliper.The reason I removed them was just to clean and service the brakes,lesson learned.

Last year I changed all 4 disks and pads and had no issue with the pedal going to the floor.

@el_diablo969 You might be right,I might have to bleed the master.Im going to check over my work and then try to bleed the master.
 
Je ne comprends pas trop ce que tu as fait comme procédure pour bleeder, mais j’ai aussi le feeling que tu ne l’as pas fait correctement. L’as-tu fait par gravité ou est-ce que quelqu’un pompait ta pédale ?

Un autre truc: parfois, si quelqu’un pompe la pédale pour bleeder les freins d’une voiture peu récente, ça peut être suffisant pour scrapper le master cylindre. C’est quoi ta voiture ?
 
TegraTegra said:
The brakes are brembo's,so you can split the caliper in 2 by removing 4 bolts and it separates.I did not touch anything else besides the caliper.The reason I removed them was just to clean and service the brakes,lesson learned.

.
Click to expand...

CEtte portion la fais aucun sens. Pour nettoyer ces frein faut pas les séparé en deux..... Si ta ouvert ton caliper en deux ces sur que ta fais rentrer de l'aire partout dans ton système. Continue a bleeder.
 
TegraTegra said:
Okay so the fluid is topped off,it never got low enough to get air into the system.I was constantly checking it and topping it off.

The brakes are brembo's,so you can split the caliper in 2 by removing 4 bolts and it separates.I did not touch anything else besides the caliper.The reason I removed them was just to clean and service the brakes,lesson learned.

Last year I changed all 4 disks and pads and had no issue with the pedal going to the floor.

@el_diablo969 You might be right,I might have to bleed the master.Im going to check over my work and then try to bleed the master.
Click to expand...


Ok I know what you mean then, you have brembos with pistons on each side and you can dissasemble them... as soon as you split those, air will enter the system because the oil pressure travels through the caliper to reach the other piston...

You have to bleed all 4 corners then

You probably have something like this :

Picture024-1.jpg
 
J'ai fait une conversion de freins sur mon propre véhicule et j'ai eu à saigner le Master cylindre quand même. Faut croire que l'air a réussi à se rendre au Master cylindre quand même vu que la pédale restait molle :dunno:
 
A tu meler le caliper de droite avec celui de gauche?
Si c'est le cas, les bleeder tombent en bas ce qui cause ton probleme d'air dans le systeme (incapable de bleeder correctement)
 
Rice.Rockets said:
Ok I know what you mean then, you have brembos with pistons on each side and you can dissasemble them... as soon as you split those, air will enter the system because the oil pressure travels through the caliper to reach the other piston...

You have to bleed all 4 corners then

You probably have something like this :

View attachment 23142
Click to expand...

exact!
Si tu a splitté les calipers...bleed! et longtemps. les ligne au complet peuvent s'être vidé tranquillement le temps que tu nettoyais les caliper (job inutile de splitté les caliper: tu lave juste ce qui est apparent!)
 
so my method is

-one person in the car pumping the brakes 3-4 times and then holds.

-one person is outside of the car waiting for the person inside to hold and he then releases and closes the valve.

-repeat until air is out.

My dads way is

-one person in the car

-one person outside the car,opens the valve

-person inside the car pumps slowly 3-4 times and then holds

-person outside closes the valve

-repeat until air is out

The car is a 2005 sti
 
Rice.Rockets said:
Ok I know what you mean then, you have brembos with pistons on each side and you can dissasemble them... as soon as you split those, air will enter the system because the oil pressure travels through the caliper to reach the other piston...

You have to bleed all 4 corners then

You probably have something like this :

View attachment 23142
Click to expand...


Bingo! those are my brakes. Should I remove the calipers and recheck my work? Maybe its leaking inside? or just continue to bleed?
 
maxpat82 said:
exact!
Si tu a splitté les calipers...bleed! et longtemps. les ligne au complet peuvent s'être vidé tranquillement le temps que tu nettoyais les caliper (job inutile de splitté les caliper: tu lave juste ce qui est apparent!)
Click to expand...

I will never be removing the calipers again unless I need to replace them.Figured it would do some good to remove it and clean it thoroughly,no point,just causes problems.
 
Thought I would mention,every time I press the brake you hear a suction sounds near the master cylinder and there are lots of air bubbles in the reservoir every times it's pressed.
 
I get in and pump the brakes to build the pressure,then I start the car and the pedal go straight to the floor.
Click to expand...

So...

Engine off
Pump the brakes (deplete the vacuum reserve)
Pedal become hard, (worse without vacuum assist)
Start Engine
Vacuum assist kicks in
Pedal goes down.


Is it me, or is that normal?
 
sounds normal,except the pedal never gains enough pressure to make the car brake.It might build 1/4 the normal pressure but then the pedal goes right to the floor.
 
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