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Old 05-13-2010, 12:38 PM   #1
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Default MRX4 Brake Slide

I have an MRX4 I purchased used. When I try to brake, even at moderate or slow speeds, it begins a slide and will spin out if I brake hard. This occurs even if I am just going straight.

Is there some adjustment that needs to be made? Differential, brake pads? Or is something worn out?
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Old 05-13-2010, 12:49 PM   #2
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your brakes are set too hard, soften it up. a one-way will cause you to spin out if you brakes hard.

you don't want to set your brakes to go dead stop when you press it, it will cause you to spin out.

set it to slow the car down, not to stop the car instantly.
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Old 05-13-2010, 01:32 PM   #3
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I toned down the brakes and even tried turning on my Futaba transmitter's ABS system.

Certainly, that helped a lot, but there is still a bias to the right. It wants to turn right when I brake. And I can't brake very hard at all or it will turn hard to the right and eventually spin out.

Seems like there is something out of alignment? Otherwise, the maximum braking I can tolerate is slow enough that it just kind of slowly slows down to a coast and eventually stops after a long time.
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Old 05-13-2010, 01:45 PM   #4
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If the car pulls when you brake there is a chassis setup issue, probably with droop screw setting on the rear .
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Old 05-13-2010, 01:48 PM   #5
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Check down stop setting front and REAR, front and REAR toe and tire diameter front and REARS. If the rear axle locks up it will spin out.
If the brake seams to act like it's a light switch (OFF&ON), then the brake cam and or the pads are shot.
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Old 05-13-2010, 02:47 PM   #6
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Originally Posted by tetris View Post
the maximum braking I can tolerate is slow enough that it just kind of slowly slows down to a coast and eventually stops after a long time.
That is basically how it is. The only wheels that are breaking are the rear wheels. The brakes are only to slow the car. You can't just stop that car as fast as a 1/10 scale car.
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Old 05-13-2010, 04:45 PM   #7
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Originally Posted by MugenDrew View Post
Check ...diameter front and REARS.
Actually, I just realized that the tires I am using are just some randomly chosen tires from a huge bag of used tires that came with the car. I have no idea if they are matched. The diameters of all four tires are probably all out of whack.

As far as the brake pads, it seems that they do work smoothly. The more the servo pushes on the brakes, the more resistance there is. Its not on/off.
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Old 05-13-2010, 08:29 PM   #8
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was there ever a front spool or diff available for the mrx4?
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Old 05-13-2010, 08:30 PM   #9
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was there ever a front spool or diff available for the mrx4?
no
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Old 05-14-2010, 02:32 AM   #10
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If you have both front and rear spool, how could you drive it ?

Regarding the car spins when you brake, check the droop screws on all four corners. One or two must have been tweaked.
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Old 05-14-2010, 05:50 AM   #11
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no
There is a front spool made for the MRX4. I tried running it a few times but it takes some getting use to. It allows you to carry more speed into the turn by allowing you to brake all four wheels thus less spin out. Winners Circle may still have them in stock. Ken
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Old 05-14-2010, 09:25 AM   #12
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Regarding the car spins when you brake, check the droop screws on all four corners. One or two must have been tweaked.
OK, but if all four tires are randomly chosen from a big bag of used tires with different diameters and wear levels, that could certainly be the culprit too, no?
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Old 05-14-2010, 09:32 AM   #13
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OK, but if all four tires are randomly chosen from a big bag of used tires with different diameters and wear levels, that could certainly be the culprit too, no?
Yes it could.
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