Jump to content



silly brake question


  • Please log in to reply
9 replies to this topic

#1 Gibbon

Gibbon

    Member

  • Members
  • PipPipPip
  • 40 posts
  • Location:New Zealand

Posted 16 November 2019 - 10:44 PM

Hi, i'm struggling to retract the rear brake pistons on an 85 starion project car which arrived with seized brakes. They look like your regular wind-in style pistons which I'm reasonably familiar with, except that they won't wind in for love nor money.

The maintenance manual says "push the piston in using (special tool)", and has a note about leaving the indentations in the correct orientation to mate with the pad. And the little illustration pretty much shows a guy pushing the piston straight back into the caliper, not winding it in. I thought the wind in design was standard design, but there's an exception to every rule, so...

Do the rear pistons push or wind in?

edit: I'll move this to Virtual Mechanic, where there's a bit more activity

Edited by Gibbon, 17 November 2019 - 01:58 AM.






#2 MotoCam360

MotoCam360

    Motocam360

  • Vendors
  • PipPipPip
  • 2,196 posts
  • Gender:Male
  • Location:Seattle
  • Interests:SQ, SY/TY, BMW, electronics, motorcycles, snowbikes
  • Model:Conquest

Posted 17 November 2019 - 03:46 AM

I just did the rears on my '88 and they are "wind in".
Tim

My Feedback Link
'87 Red 5spd | '88 Yellow auto | '88 Fiji Auto | '89 Fiji auto
Posted Image
  New/Used SQ parts can be found on Ebay under "MotoCam360"
website: https://www.motocam3...ducts/starquest

#3 Ressurect1on

Ressurect1on

    Member

  • Members
  • PipPipPip
  • 101 posts
  • Gender:Male
  • Location:KC, MO
  • Model:Conquest

Posted 17 November 2019 - 06:00 PM

they are wind in, my rear calipers wouldn't push in while turning for love nor money either, they likely have crud holding them in place after being in use for around 30 years, if you can, see if you can find some refurbs from the local parts store, or if your familiar with rebuilding turn in style calipers with integrated parking brakes, pop out the pistons and clean up the bore, piston and seals.

#4 Gibbon

Gibbon

    Member

  • Members
  • PipPipPip
  • 40 posts
  • Location:New Zealand

Posted 20 November 2019 - 06:26 PM

Do the pistons pop straight out or do they wind out? It's hard to imagine the pistons winding out as they extend during normal usage, but it's equally hard to imagine the mechanics that would allow a piston to extend straight out, yet need to be wound back in

#5 Turbo Cary

Turbo Cary

    Established Member

  • Members
  • PipPipPip
  • 1,826 posts
  • Gender:Male
  • Location:Charleston, South Carolina
  • Model:Conquest

Posted 30 November 2019 - 07:42 AM

The pistons are threaded on the outside of the piston. As fluid pushes against them they twist outward and when you left off they slightly twist back letting off pressure.

If they are seized, remove the caliper and hose from the caliper. Get PB blaster or WD40 and spray inside the fluid port. Allow to soak for an hour or so. Then work the piston back and forth with the compressor tool. You will need a caliper rebuild kit most likely but if the piston and bore arent pitted or scored, you can reseal it.

Use non chlorinated brake cleaner to clean the bore and ports when finished.

To remove front pistons you place a small block of wood between the caliper tangs and the piston. Use compressed air and a blow gun to pop the piston out by shooting air into the hose port.

Edited by Turbo Cary, 30 November 2019 - 07:43 AM.


#6 rehoward

rehoward

    Member

  • Members
  • PipPipPip
  • 149 posts
  • Gender:Male
  • Location:Everett, WA
  • Interests:Cars, motorcycles, music
  • Model:Conquest

Posted 06 February 2020 - 12:07 AM

According to my factory manual the rear caliper pistons for a 1988 Conquest do not wind in.  It shows installing the piston just by pushing it in using thumbs and fingers and cautions to not rotate it.  There must be a couple of versions of this caliper in use for the same year?  Brake pics on web (I hope), trying out ImgBB. Click on link below.

https://ibb.co/album/d9zjFa

#7 tux

tux

    Established Member

  • Members
  • PipPipPip
  • 1,549 posts
  • Gender:Male
  • Location:new jersey
  • Model:Starion

Posted 02 March 2020 - 12:36 AM

I have never needed to wind in the calipers

#8 Gibbon

Gibbon

    Member

  • Members
  • PipPipPip
  • 40 posts
  • Location:New Zealand

Posted 04 April 2020 - 09:08 PM

following up for the heck of it, i was eventually able to wind them in with a crapload of heat and having purchased a very cheap and nasty windback tool

#9 Preludedude

Preludedude

    Established Member

  • Members
  • PipPipPip
  • 3,458 posts
  • Gender:Male
  • Location:Spartanburg, SC
  • Model:Conquest

Posted 04 April 2020 - 09:14 PM

Mine are wind in.  And the right rear was very hard to turn but I got it done.  Very slow process.

#10 croquest87

croquest87

    Established Member

  • Members
  • PipPipPip
  • 1,775 posts
  • Gender:Male
  • Location:willoughby
  • Interests:all things mechanical
  • Model:Conquest

Posted 05 April 2020 - 05:28 AM

If you take the whole thing apart and clean and lube it . It all moves smooth no retractor required.




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users