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Dakaty
GenIII
10/16/2002
12:15:57
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 Subject: Master cylinder question
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Message:
I took my 2001 QC in to the Dealer to have my master cylinder looked at. When I am at a stop, I can put pressure on the brake pedal and it will VERY slowly go to the floor.
The Dodge Tech said that was normal!!! WTF? I never noticed this before.
I asked him.."If I go sit in a new Dakota on the showroom floor, would it do the same thing?" He said it would. I haven't done it yet, but I'm going to!!
Anyone have this same thing going on with their master cylinder?
Thanks
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chris
Dodge Dakota
JOIN HERE
10/16/2002
16:58:03
| RE: Master cylinder question
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Message:
You have pressure running through the lines? That is probably a good thing. If you can ever push them to the floor with no effort, well prepare for impact. Yes, this is normal. You can pump them a few times and get the same affect. Sorry dude, everythings fine.
--
Chris
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J-R-M
Dodge Dakota
JOIN HERE
10/16/2002
20:40:30
| RE: Master cylinder question
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Message:
Ok here is the deal.
From what your saying it sounds like you have a Bad Master Cylinder.
Here is a sure way to find out.....
There are 2 way's a Master Cylinder goes bad.
1. It start's leaking between the Brake Booster and the Master Cylinder.
2. There is what Mechanic's call Bypassing it's where the Master Cylinder leaks internaly between the front and back pistons. The way you find that out is you start up the Truck and pump the Brakes about 4 times then on the 4th or 5th pump Hold pressure on the Brake pedal. Doesn't really matter how hard or how soft, eather case if the Brake Pedal slowly creaps to the floor and stops about 2 inches before it hit's the floor or it goes to the floor the Master Cylinder is BAD! If it doesn't move and just stay's in the same place then it's good and working correctly.
I know this because I have had experance with this on my prevous truck and I'm a Mechanic by trait.
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Gene
Dodge Dakota
JOIN HERE
1/30/2003
10:58:07
|  RE: Master cylinder question
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Message:
I had normal brakes until yesterday. I was braking firmly but not excessively hard. It felt like I had hit ice. The truck broke traction (felt like it did) and the ABS system engaged. Immediatly afterwards the brake pedal was soft and faded. I pumped the brakes several times to regain pressure and held the pedal. It faded to the floor and the ABS/Brake light came on. I still have some braking (rear only I think) but the pedal is still soft and fading. I suspect a master cylinder internal seal has gone out. How do I reset the brake light when I replace the master cylinder?
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chris
Dodge Dakota
JOIN HERE
1/30/2003
17:59:46
| RE: Master cylinder question
IP: Logged
Message:
i can agree with chris
take the truck up to 60k and stomp on the brakes trying to drive the pedal through the floor. your pedal well be hard and stay there after you stop and then begin to bleed down the booster is dependant on engine vacum to apply the nessecary assist. the more vacum the more assist youll get cause your probably high ballin. both mine the 93 and the 2000 do it. it actually makes sense to not use egine vacum at a stop cause you dont need it
but if it bothers you , take the truck out of the drive way point her at nothing, stomp the brakes and and try to drive away. your rear wheels will probably spin but she wont move ,if she does, get back to the dealer .
by the way after you do that put the tranny in neutral asap and throtlle to 2000 rpm to cool her down
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