|
850 / S70 & V70 '96-'99 / C70 '97-'05 General Forum for the 850 and P80-platform 70-series models |
Information |
|
Rebuilding brake calipers and carriersViews : 766 Replies : 9Users Viewing This Thread : |
|
Thread Tools | Display Modes |
Oct 19th, 2023, 16:54 | #1 |
Premier Member
Last Online: May 8th, 2024 07:11
Join Date: Oct 2004
Location: London/West Country
|
Rebuilding brake calipers and carriers
Hi all
I am rebuilding some front brake calipers (normal V70 ATE) and carriers (in fact two sets). Using rebuild kit from BiggRed https://www.biggred.co.uk/product/br...-brkp10/BRKP10 I have dismantled the calipers (removed the bleed screws, pistons and seals), degreased/washed then I have used phosphoric acid (about 80%) which eats the heavy rust away in about 24 hours. Then I rinse and wire brush the black slime/deposit and wire brush again. Rinse and repeat as necessary. Then place in a hot domestic oven to dry out. A thin layer of rust forms - as expected. I want to paint, probably using Halfords Silver spray paint. Shall I paint straight onto that final rust, or wire brush it first? What about using Fertan rust converter? https://www.fertan.co.uk/product/fertan-rust-converter/ Would that convert the rust into a protective layer or am I better off without that? Suggestions welcome. If this process works, I have some rear calipers which I would rebuild in the same way Steve
__________________
V70 2.5 Turbo AWD Man. 1999 Red V70 2.5 10V Auto 1998 Green C70 T 20V Auto Conv. 2001 Blue, C70 T5 Auto Conv. 2000 Blue V70 2.5 Turbo AWD Auto 1998 Green, V70 2.5 10V Auto BiFuel 1999 Red (scrapped) V70 20v Auto 1999 Green (scrapped) |
Oct 19th, 2023, 18:22 | #2 |
VOC Member
Last Online: Yesterday 20:41
Join Date: Mar 2008
Location: Northampton
|
I haven't used the exact same technique, but I have used Por15 on many parts. Very similar process. They actually tell you to ignore any surface flash rust that may form before painting. I always just give it a wire brush as it makes me feel better before applying the paint.
__________________
2001 V40 2.0lt Sport Lux - Daily Driver. 178k miles. 2003 C70 2.4 GT Convertible - Garage Queen. 67k miles. http://www.neptuno6benagil.com |
The Following User Says Thank You to ITSv40 For This Useful Post: |
Oct 19th, 2023, 21:07 | #3 |
Premier Member
Last Online: Yesterday 22:18
Join Date: Jan 2011
Location: Horne (Nr. Horley)
|
I've got quite a lot of experience with rusty parts, having restored several cars and a tractor. Personally I'd get as much rust off as possible (ideally sandblasting) then paint/spray with etch primer, which does as the name suggests - it bonds to the steel better than anything else ever will. Then paint over with your top coat of choice, if it's cellulose based (e.g. an aerosol of caliper paint) then so much the better. Several thin coats, allowing each one to go tacky before applying the next.
__________________
Some people are like Slinkies, they serve no useful purpose but they still bring a smile to your face when you push them downstairs. |
The Following 2 Users Say Thank You to Luxobarge For This Useful Post: |
Oct 19th, 2023, 21:15 | #4 |
Premier Member
Last Online: May 8th, 2024 07:11
Join Date: Oct 2004
Location: London/West Country
|
Hi all
The phosphoric acid is very effective at removing rust. And unlike spirit of salts, or muriatic acid or various other chemicals, it doesn't attack the iron, just the rust. I should have taken some photos. These brakes were very very heavily rusted. I considered electrolysis but preferred to remove the rust rather than convert it back into iron. Steve
__________________
V70 2.5 Turbo AWD Man. 1999 Red V70 2.5 10V Auto 1998 Green C70 T 20V Auto Conv. 2001 Blue, C70 T5 Auto Conv. 2000 Blue V70 2.5 Turbo AWD Auto 1998 Green, V70 2.5 10V Auto BiFuel 1999 Red (scrapped) V70 20v Auto 1999 Green (scrapped) |
Oct 19th, 2023, 22:01 | #5 |
VOC Member
Last Online: Yesterday 20:41
Join Date: Mar 2008
Location: Northampton
|
I know it is not brake callipers - they are quite difficult to clean up without sandblasting. I repainted the servo after it had suffered years of careless topping up of brake fluid and had gone quite rusty below the master cylinder. I cleaned off all the paint with stripper and a wire brush. First attachment. Then treated with the POR15 phosphate and washed off - that got into the pits that the brushing could not. Second attachment. Then brush painted the top coat of paint on - two coats, it is very self levelling so the brush marks soon spread out leaving a smooth finish. Third attachment. That was done five years ago and still all good.
__________________
2001 V40 2.0lt Sport Lux - Daily Driver. 178k miles. 2003 C70 2.4 GT Convertible - Garage Queen. 67k miles. http://www.neptuno6benagil.com |
Oct 25th, 2023, 17:06 | #6 |
Premier Member
Last Online: May 8th, 2024 07:11
Join Date: Oct 2004
Location: London/West Country
|
Well, I didn't expect this!
Two front sets - the 4 calipers, 4 carriers - derusting, painting and caliper rebuilds went fine. Assembling everything back onto the car .... The caliper slider pins (Allen H7 key), silicone greased and threadlocked through the new slider boots, didn't seem to be threading in correctly. Taking things apart, I can see now that those threads in every carrier have turned to dust. They must have been heavily rusted and the phosphoric acid has eaten the threads away completely. Obviously I should have checked that earlier in the process, but I have never encountered that problem before. New carriers for the 280mm discs are still available from Volvo for £47.76 inc vat each Part number is 8251156. Delivery from Sweden is 4 - 8 weeks I wonder if one can safely use thread inserts in the 4 carriers? (All 8 holes have the same problem). But there is not a lot of metal around that hole. Or I could find a better used carrier and think twice before derusting it! Or find somewhere that can sell me at least two new ones quicker than my local Volvo dealer. Comments and suggestions welcome. Steve
__________________
V70 2.5 Turbo AWD Man. 1999 Red V70 2.5 10V Auto 1998 Green C70 T 20V Auto Conv. 2001 Blue, C70 T5 Auto Conv. 2000 Blue V70 2.5 Turbo AWD Auto 1998 Green, V70 2.5 10V Auto BiFuel 1999 Red (scrapped) V70 20v Auto 1999 Green (scrapped) |
Oct 25th, 2023, 17:48 | #7 |
Premier Member
Last Online: Yesterday 23:15
Join Date: Mar 2017
Location: Manchester
|
short term answer get some from a breakers and then do a search for some new ones at your leisure try volvo main dealer for a base price then all the usual places ecp gsf and auto doc. parts for volvo ect
|
Oct 25th, 2023, 23:25 | #8 |
VOC Member
Last Online: Yesterday 23:28
Join Date: Dec 2001
Location: Hull
|
Interesting.
If the threads on the carriers were that heavily rusted, there can't have been much remaining strength in them anyway. Far better to find out now albeit rather frustrating. I have to say it's not something I'd ever considered. Martin |
Oct 26th, 2023, 08:01 | #9 |
VOC Member
Last Online: Yesterday 20:41
Join Date: Mar 2008
Location: Northampton
|
Yes sounds like a lucky escape.
__________________
2001 V40 2.0lt Sport Lux - Daily Driver. 178k miles. 2003 C70 2.4 GT Convertible - Garage Queen. 67k miles. http://www.neptuno6benagil.com |
Oct 26th, 2023, 09:17 | #10 |
Premier Member
Last Online: May 8th, 2024 07:11
Join Date: Oct 2004
Location: London/West Country
|
Those sets were ones that I had picked up from cars being broken.
I derusted the carriers because they were particularly bad. Just bought a couple more (calipers and carriers) off ebay, so will inspect them carefully. Thinking about the danger if the slider pin threads had failed completely - I am pretty sure that the pads would still retained by the rest of the carrier. Will have a think and probably send photos. Steve
__________________
V70 2.5 Turbo AWD Man. 1999 Red V70 2.5 10V Auto 1998 Green C70 T 20V Auto Conv. 2001 Blue, C70 T5 Auto Conv. 2000 Blue V70 2.5 Turbo AWD Auto 1998 Green, V70 2.5 10V Auto BiFuel 1999 Red (scrapped) V70 20v Auto 1999 Green (scrapped) Last edited by SteveSarre; Oct 26th, 2023 at 09:21. |
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests) | |
|
|