| Author | Topic |
|---|
Registered:
August 2002
|
|
MA70 brake booster into MA61
|
Tue, 29 April 2003 13:47
|
 |
Again, something else that has been read on celicasupra forums
A direct swap (supposedly) and bolts straight in, is the MKIII brake booster.
Now the MKIII uses a big booster and master cylinder etc.
Supposedly the bigger booster with the standard MA61 master cylinder is an upgrade. Increase pressure in the lines?
any thoughts?
|
|
|
Location:
Lost in the K hole
Registered:
May 2002
|
|
Re: MA70 brake booster into MA61
|
Tue, 29 April 2003 14:19
|
|
i dont buy it - doesnt make much sense...
the master cyl would have to be the same bore and stroke as the ma61, otherwise the master/slave ratio would be all screwed up, and pedal feel would either be way too stiff or too spongey.
as for the brake booster itself, it would have to be significantly bigger in surface area to provide any real inprovment in assist id imagine, and im not sure HOW much improvemnt that would provide even if it were...
correct me if im wrong...
either way though, there's no magic way of increasing pressure in the lines short of pushing on the pedal harder.
brake power and reponsiveness is based on good master/slave ratio, minimal flexion/expansion in the brake lines under pressure, minimal flex in the claiper itself, a decent sized rotor, and good pad material (size of pad and rotor is good for heat dissipation - reduced pad fade)
cheers
ed
|
|
|
Location:
Lost in the K hole
Registered:
May 2002
|
|
|
Location:
Brisbane
Registered:
May 2002
|
|
Re: MA70 brake booster into MA61
|
Tue, 29 April 2003 23:21
|
|
The brake booster has zero effect on braking effectiveness; it's only there to make life easier for your right leg. "Upgrading" the booster will make the pedal lighter, but your brakes will perform exactly the same as they always have.
Personally I can't stand a light pedal; I prefer something with a bit of feedback. This becomes important when you're doing stuff like threshold braking!
|
|
|
Registered:
August 2002
|
|
Re: MA70 brake booster into MA61
|
Wed, 30 April 2003 12:19
|
|
Well currently my brake pedal is rock hard and i prefer a little bit of give, although i can understand the threshold braking.
How about this then, i noticed Ed mention engine vacuum levels. What if i installed a 7mgte? The vacuum levels would alter then wouldnt they?
If upgrading to the 7mgte would it work upgrading to the MA70 brake booster?
Would the turbo ma70 be equiped with a different booster to the N/A version?
Or should i not even go near it with a 10ft stick?
|
|
|
Location:
Brisbane
Registered:
May 2002
|
|
Re: MA70 brake booster into MA61
|
Wed, 30 April 2003 12:24
|
|
Rock hard? Ya pansy, Supras have a light pedal! You should try my Celica some day. 
I wouldn't recommend changing the booster unless you genuinely have difficulty pushing the pedal down. Somehow I doubt that's the case!
|
|
|
Registered:
August 2002
|
|
Re: MA70 brake booster into MA61
|
Wed, 30 April 2003 12:48
|
|
Its not physically hard for me to push down
I would just think that the stock brakes shouldnt be that heavy, thats what i would have thought anyway.
Guess i was looking for a cheap brake upgrade 
|
|
|
Location:
Lost in the K hole
Registered:
May 2002
|
|
Re: MA70 brake booster into MA61
|
Thu, 01 May 2003 00:37
|
|
7mgte will pull the same engine VACUUM - but it will have positive pressure on boost, so youll just need a one way valve in the vacuum line to the booster to make sure it doesnt de-pressurise under boost.
i wouldnt bother touching it AT ALL - soo very not worth the effort.
unless youre a pansy who like feather light pedal feel
|
|
|
Location:
Brisbane
Registered:
May 2002
|
|
Re: MA70 brake booster into MA61
|
Thu, 01 May 2003 01:08
|
|
Actually the booster already has a one-way valve in it. That's why the booster still works once or twice after you've shut the engine off. My stock booster works fine with a turbo engine, even when I'm using both pedals at once! Case in point: my "4 wheel burnout" at Dubbo. 
|
|
|
Registered:
June 2002
|
|
Re: MA70 brake booster into MA61
|
Thu, 01 May 2003 04:07
|
|
Norbie: Is this oneway valve inside the booster or external??
I spoke to the local brake & clutch man about obtaining a oneway valve for my 1JZ'd BMW, and he said not to bother.
So now I'm scratching my head a bit??
My EVO and my old 323 DOHC Turbo did not have an external oneway valve.
Still scratching...
|
|
|
Location:
Brisbane
Registered:
May 2002
|
|
Re: MA70 brake booster into MA61
|
Thu, 01 May 2003 05:39
|
|
The valve can be either internal or external, depending on the car. From memory it's external on my Supra.
Note that a one-way valve isn't necessary most of the time. Remember you almost always use the brakes when your foot is off the throttle, which means there is plenty of vacuum available in the manifold.
|
|
|
Registered:
June 2002
|
|
Re: MA70 brake booster into MA61
|
Thu, 01 May 2003 22:08
|
|
I'm more worried about blowing the booster apart from the boost.
As it may not handle it??
|
|
|
