brake booster question

[Steve73tii]

After replacing all the pedal box and brake linkage bushings, my brake pedal still moves about an inch before activating the brakes.

From what I can see (feel & hear) there is just takeup before the booster pushrod hits the master cylinder piston. Doesn't seem to be hydraulic... I have a firm brake pedal and good brakes after the takeup.

Question: is the pushrod threaded for length adjustment? Any other suggestions? It's a tii booster if that helps.

Thanks,

Steve

[BLUNT]

yes it is, its adjustable towards the pedal box end. have a look in there

[c.d.iesel]

....as well as rear brake shoe adjustment also

plays a huge part in pedal feel.

[Steve73tii]

Thanks Blunt.

I'll adjust it when I get home, but I started thinking about it this morning and it was bugging me.

Steve

[BillWilliams]

Here is a picture of the adjustment in the pedal box. The configuration on the brake booster is the same.

If everything is hooked up, you need to loosen the jam nut at the pedal box and at the brake booster. You notice the flat spot son the rod. These flat spots allow you to turn the rod with an open (spanner) wrench. I forgot the size 10mm I think.

Brakes activate late may = Linkage

Soft pedal = poorly adjusted rear brakes

Pedals that are soft but pump up to solid = air in lines

[Steve73tii]

Thanks C.D.

I think the rears are good, based on the ebrake lever, but I'll double check.

Off topic, I was meaning to ask about your profile -- Is that "South West Connecticut minus Darien"? I ask because I have a family member who may or may not be from that area...

Steve

[Steve73tii]

Hi Bill,

Thanks. I did adjust the pull rod at the pedal box end to get the pedal heights level. My original question was about the pushrod in the brake booster itself, whether I could unscrew it to lengthen it or if I need shims behind the master cylinder piston or something. I think Steve answered that question -- I'm going to go home and try it. Hopefully I can wait til after work...

Steve

[BillWilliams]

adjustable. I do not think it is.

Because when you use the 2002 booster in an e-30 with a bigger motor conversion, you have to cut and weld that rod.

[c.d.iesel]

no, that means IN Darien

you can find me at BMW of Darien,

when I'm not on vacation in my 2002,

325xit

c.d.