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MazdaSpeed 3/6 - Suspension & Brakes Discussion for suspension items like coilovers, springs, sway bars, mounts,chassis bracing and brakes.


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 Old 02-10-2017, 05:04 AM   #1
 
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Default Brake Pedal SUPER HARD to press after boosting

Okay, so I'm doing my own thing, logging, tuning, logging, tuning.

But all of a sudden after a HARD BOOSTING I am unable to press the brake pedal for about 3 seconds then it gets soft and I can brake again, IT'S SO SCARY and DANGEROUS.

Wondering if anyone could shed me some light.

Car: Mazdaspeed 3 2008 Gen1

It's definitely not brake fade I know what that's like


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 Old 02-10-2017, 06:15 AM   #2
 
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Bad check valve in the vacuum circuit to your brake booster.
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 Old 02-10-2017, 08:08 AM   #3
 
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Your car loves the feeling of going fast so much it will do anything to not stop?
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 Old 02-10-2017, 11:18 AM   #4
 
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Originally Posted by Crarrs View Post
Bad check valve in the vacuum circuit to your brake booster.


That makes a lot of sense, I'm going to get that replaced asap, I'll let you know when I replace it.

Thanks for your help


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 Old 02-10-2017, 08:08 PM   #5
 
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Where would I find the one way check valve?


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 Old 02-10-2017, 09:50 PM   #6
 
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Try the bulging part of the vacuum hose coming off the intake manifold, next to the HPFP in your photo. If not there, maybe behind the heat shield. I don't know anything about how that hose is routed on a RHD car.
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 Old 02-11-2017, 02:59 AM   #7
 
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Originally Posted by Crarrs View Post
Try the bulging part of the vacuum hose coming off the intake manifold, next to the HPFP in your photo. If not there, maybe behind the heat shield. I don't know anything about how that hose is routed on a RHD car.


I couldn't see any valve in the intake side of the vacuum line, checked he line next to the HPFP.

Could you please send me a photo of what I am looking for or is it really different


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 Old 02-11-2017, 04:01 AM   #8
 
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Would this be it? I found this part on my Brake Booster


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 Old 02-11-2017, 07:51 AM   #9
 
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You're VIP, so you can download the full service manual from this site. Start there.
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 Old 02-11-2017, 07:52 AM   #10
 
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Originally Posted by Crarrs View Post
You're VIP, so you can download the full service manual from this site. Start there.


Didn't even know that existed, only donated because I appreciated the help with my intank Methanol tuning. Cheers!


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 Old 02-12-2017, 05:47 PM   #11
 
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Sooooo I found the Check Valve, I can blow through and back in.

Called Mazda parts division and he said yeap that's the check valve.

So I'm ordering the part now to fit, also I put a quick photo together what it looks like


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 Old 01-12-2018, 02:44 AM   #12
 
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Originally Posted by FSRRM View Post


Sooooo I found the Check Valve, I can blow through and back in.

Called Mazda parts division and he said yeap that's the check valve.

So I'm ordering the part now to fit, also I put a quick photo together what it looks like


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hello
My ms6 got brake problem as u mention above. may i know part no for CHECK VALVE
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 Old 01-12-2018, 07:35 AM   #13
 
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Google it. It's not hard.
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 Old 02-17-2018, 11:55 AM   #14
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hi all i love mazda cars .
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 Old 02-17-2018, 12:03 PM   #15
 
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Originally Posted by hichamaziz View Post
hi all i love mazda cars .
Are you that bored you have nothing better to do but troll?
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 Old 02-17-2018, 08:21 PM   #16
 
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Originally Posted by hichamaziz View Post
hi all i love mazda cars .
And i love cumming on your mom's face but you hear me bragging about it in a fucking brake issue thread.

well now you have!

EDIT: God dammit im as brown as the mustache i gave your mom fuck!!!!
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 Old 02-17-2018, 11:07 PM   #17
 
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Originally Posted by 5doorsoffury View Post
And i love cumming on your mom's face but you hear me bragging about it in a fucking brake issue thread.

well now you have!

EDIT: God dammit im as brown as the mustache i gave your mom fuck!!!!
I actually did hear about it prior to this situation thank you very much.
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2010 black mica speed3
The go: Depo racing: downpipe (100 cell count), custom: FMIC. HTP: 3.5" intake, under route piping. JBR: shortshifter, RSB. Autotech: HPFP internals. Go fast bits: hybrid BPV, VMR: 18x8.5 V710s, Bridgestone: potenza re760 245/40/18, KW: v3 coilovers,SPC: camber arms, freektuned, Damond Motorsports: dual OCC, PMM, PCV plate, RMM, TMM, EGR delete, FoSt mani, Corksport: battery box(fuck this thing), injector seals, Cobb: EBCS, AP v3. AEM: methanol. Seibon: carbon fiber hood. UR: catback. Bosch: 3bar. BNR: s4, DNP: EWG manifold, Tial: 38mm mvs EWG.

The show: 5% tint all around, 50% tint windshield, rally armor mudflaps, Sony XAV64BT touchscreen headunit, katskin leather interior, CPE relocation plate, Maisonvi weighted shift knob, Corksport hoodscoop, black housing headlights.

Soon:built motor
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 Old 02-28-2018, 10:46 AM   #18
 
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Originally Posted by FSRRM View Post

Sooooo I found the Check Valve, I can blow through and back in.

Called Mazda parts division and he said yeap that's the check valve.

So I'm ordering the part now to fit, also I put a quick photo together what it looks like


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So what was the part number you ordered?
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 Old 03-05-2018, 03:20 PM   #19
 
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Originally Posted by Djohns View Post
Are you that bored you have nothing better to do but troll?
Don't feed the trolls. They just get bigger.
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 Old 03-05-2018, 05:15 PM   #20
 
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It's okay now. Troll haz been banned.
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'06 MS6 GT-162k Miles(Forged@157,116)
Manley Pistons & Rods, King Bearings
Stock Head/Cams, Stock Int/Exh Manifolds
Versatuner, 3-bar MAP, ITV22, CP-e TMIC
CS Turbo/DP/RP/HPFP/BPV/R-DiffMount
White Widow F-DiffMount, Whiteline RSB
Rear Russian Bushings, Poly FSB Bushings Magnaflow CBE, ACT 6-puck/Streetlite
JBR Tru-3.5/3-port EBCS/EGR-D
Damond RMM/PMM/OCC/PCV Plate
Other rides:
2002 Tacoma ExtCab 2.4L 5spd 2WD - 355k mile Speed support vehicle.
2004 Olds Alero ECOtec 2.2 - Broken (since Christmas 2015 and I really need to get rid of it)
History:
2008 GSX-R 1000 - Stolen (With several runs past 180, I'd probably be dead by now if it wasn't stolen. So in a way, I'm thankful.)
1988 RX-7 TII - Sold (Megasquirt, streetport, filter-on-turbo SRI, custom TBE, 20psi boost creep on OE turbo, OE TMIC on ice, 13.467 @ 105.44)
1985 Camaro - Sold (est. 265bhp 5.7 swap, Edelbrock intake & Hooker headers)
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 Old 03-05-2018, 05:37 PM   #21
 
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Originally Posted by shamie View Post
So what was the part number you ordered?
Check your brake booster, if it has a check valve like this then it will be that part, I am working on getting the number for you as I didn't get it in a pretty mazda wrapping with model number on it, I just ask for the part, it's ex japan and just gets shipped to me, I will get back to you on this as I have already ordered another one for a user that's having the same issue


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 Old 03-06-2018, 08:33 AM   #22
 
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Yes my booster has a valve like that - I just can't find the part #.
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 Old 03-06-2018, 02:42 PM   #23
 
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Originally Posted by shamie View Post
Yes my booster has a valve like that - I just can't find the part #.
parts coming from Japan so I will update you when the box comes
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 Old 03-24-2018, 01:24 PM   #24
 
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Get the number yet?

Is it E112-43-826 by chance?
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 Old 03-25-2018, 01:24 PM   #25
 
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Sorry about the delay, this is the part I got from Mazda and is the part that goes into the brake booster
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 Old 03-26-2018, 03:38 PM   #26
 
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Did it fix your problem?

I have the same problem so I added an inline check valve that I got from Treadstone and it's still doing the same thing...

I guess I have to remove the old defective one?
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 Old 07-04-2018, 08:48 AM   #27
 
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Default Brake Pedal SUPER HARD to press after boosting

Air in the system would result in a spongy or soft pedal that goes to the floor. You can always try to bleed it more. I always do when something is up and 9 out of 10 times it fixes it. Also as Paul said you will be able to stop a vehicle without the booster working, you just need to press harder.

How far does the pedal move before it becomes extremely stiff?
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