breaks/front end - United Bimmer Community

**gmj4sea** · 06-20-2006, 07:10 AM

i have 1998 740i and when i touch the break at high speeds the front end gets violent. so i changed the tie rod assembly and then got a front end alignment problem got little better i also checked for any play underneth and everything feels tight. wheel bearings do not have play. any help would be great.

**Dudesky** · 06-20-2006, 07:26 AM

First thing I'd suspect is the rotors. Have them inspected for lateral runout, and corrected, if necessary. If they tell you it's 'warped', go to someone else, because they may not fix it using the correct procedure . . rotors don't actually warp; the term is a misnomer.

**EVLBLK7** · 06-20-2006, 09:51 AM

I would have to agree with Dudesky it definitely sounds like rotors, the only way you should fix that on these cars is to replace DO NOT RESURFACE them you will make the problem worse and the car will not stop as well.

**gmj4sea** · 06-22-2006, 06:43 AM

Thanks guys i will have the rotors checked and post back.

Rooz · 06-22-2006, 09:25 AM

if you change rotors, might as well change pads while you'r at it

**dinan540** · 06-22-2006, 11:06 AM

Sounds like your rotors.

**gmj4sea** · 06-29-2006, 07:17 AM

i replaced the rotors and pads in the front got a little better but still there. any more ideas.

**Dudesky** · 06-29-2006, 07:29 AM

Merely replacing the rotors often doesn't cure the wobble caused by lateral runout, because the defect is in the hub. Did they cut the new rotors to match the hub? here's more detailed info:

http://www.brakeinfo.com/html/lateral.html
http://mta.org.nz/?id=751&eid=427

If the runout was accounted for, then you might have worn suspension bushings. I don't know much about the 7 series, but on a 3 series, worn control arm bushings can manifest itself in front end shimmy when braking at high speeds.

**NewBIMMERfan85** · 04-15-2007, 11:20 AM

yeah i have an 88 735i that does that on the passenger side front but the rotor looks perfectly fine and the pads like new but itll happen very often it would wobble like hell the it would stop, but the brake system didnt have any fluid and at the time i got so the caliper what locken up when we got it and had to park so could the caliper be getting stuck a mid brake or what?

**xsperf** · 04-15-2007, 11:53 AM

Quote:

Originally Posted by NewBIMMERfan85

yeah i have an 88 735i that does that on the passenger side front but the rotor looks perfectly fine and the pads like new but itll happen very often it would wobble like hell the it would stop, but the brake system didnt have any fluid and at the time i got so the caliper what locken up when we got it and had to park so could the caliper be getting stuck a mid brake or what?

dude, what?

if its the same problem, if you are going at a low speed, like 40mph and you hit the brakes hard what happens?

**NewBIMMERfan85** · 04-15-2007, 12:19 PM

wobble like hell but it doesnt happen all the time just everyone in a while

**xsperf** · 04-15-2007, 12:33 PM

Quote:

Originally Posted by NewBIMMERfan85

wobble like hell but it doesnt happen all the time just everyone in a while

ahh, could it possibly be while you are turning, hence why there is only a problem on one side

**MTurboPower3** · 04-15-2007, 01:00 PM

mayb theres nothing wrong with the car because it is a 98 740 which is probably the best 7 series every made it could be that he doesnt know how to brake smoothly

**NewBIMMERfan85** · 04-15-2007, 05:21 PM

no im talken about a 1988 735i and theres nothing really smooth about it
like itll brake smooth sometime then it start wobbling harsh and as u apply harder it stops