Took the plunge - set of 4 new Stainless Steel Calipers for Boat Trailer

Finally after a numbers of years of "sticky calipers" , hot brakes etc - splurged and sourced new SS Alkoh Brake calipers, inclusive of Stainless Pistons and Stainless brake shoes.

Expensive, but why spend the money on SS Calipers and not SS Piston or SS shoes.

Now to get them fitted to my Dunbier trailer.

Image Upload: 

sea-kem's picture

Posts: 12074

Date Joined: 30/11/09

 Caliper body looks like cast

Tue, 2020-02-25 17:43

 Caliper body looks like cast alloy?


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hilko's picture

Posts: 23

Date Joined: 27/03/18

Hmmm good question!

Tue, 2020-02-25 19:18

Is it possible to "cast" stainless steel? I don't know. This is cast. But looks totally different to my existing one.

You had me take another look.

Just posted a couple more photos.

By description on "casting" and label it is. If you look at the nuts they look like a different kind of SS.

Maybe a Stainless Alloy? I don't know.

Any metallurgists on here who can shed light on this?


sea-kem's picture

Posts: 12074

Date Joined: 30/11/09

 Certainly cast stainless,

Tue, 2020-02-25 19:39

 Certainly cast stainless, I've been in the metal game a long time and had me looking at the study book. I'm reckoning these weren't cheap items but looked after will certainly last years. 

They do alloy with different levels of Chromium, it will have low levels of ferrite and silicon, it's amazing what they come up with these days, I'm impressed.


Love the West!

Scotte's picture

Posts: 1022

Date Joined: 07/12/06

 How much each?

Tue, 2020-02-25 19:20

 How much each?

Tom M's picture

Posts: 467

Date Joined: 22/09/15

 As an apprentice the company

Wed, 2020-02-26 08:32

 As an apprentice the company I worked for had a foundary that used to cast SS casings & parts for pumps that was back in the early 70's.


Tom M

hilko's picture

Posts: 23

Date Joined: 27/03/18

Right. Not Cheap.

Wed, 2020-02-26 09:21


Martin Trailer parts have the SS caliper but not the SS Piston or SS shoes. What's the point in doing half the job?

Time will tell.

I believe Couplemate get the SS Pistons made to order etc.

I got these from Couplemate x 4 fully assembled and negotiated on price and return-non delivery of "standard" shoes not used - from QLD.


Scotte's picture

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Date Joined: 07/12/06

 Thanks  mate

Wed, 2020-02-26 12:07

 Thanks  mate

Livewire's picture

Posts: 116

Date Joined: 25/11/16

 I've had the same problem

Wed, 2020-02-26 09:35

 I've had the same problem with my trailer. I service regularly and wash after every trip but the old smoking breaks keep popping up. I've put two shut off valves to close off the problem when needed. It's a get me out off the shit fix on the side of the road thing. The company that do my annual service are going to stainless calipers because of the amount of follow up work. I'm thinking of doing the same,  hope they fix the problem let us know how you go. 

Posts: 745

Date Joined: 09/10/06

 Having worked in the trailer

Wed, 2020-02-26 09:56

 Having worked in the trailer service industry the easiest hydro calipers to service were the trigg A200s . You could remove piston and seals and clean or replace easy.  The alkos were just a throw away item. Servicing them could be done but they never worked the same.

The secret to hydro brakes where to use on a weekly basis even just to drive around the block to keep the pistons moving. 

 your SS alkos should work well with SS pistons. When you get them, pull them apart and pre grease them. 

Posts: 289

Date Joined: 10/12/07


Wed, 2020-02-26 10:14

O'h brakes. What a pain. Are stainless calipers worth the money?  I never see the caliper rusting. It is all the other parts that rust....piston, sliding pins, pads and bleeding screws. I recently did my brakes and replaced the pins and bleeding screws with stainless ones and I went composite pistons. I think the material is bakerlite. Seem ok. We will see how they go. So far so good. Perth Brake parts has them and similar price to standard pistons. I was not aware you could get stainless pads. Not cheap though. Perhaps next service. Would hate to know what those calipers cost judging by the pads.

I turn my brakes off when I back the boat into the water so the piston and pins don't move,  and after I hose down at the end of the day I go for a quick drive and manually activate the brakes whilst driving. Heats them up and dries them out. Find that helps prolonge the life. 


Belly Fish's picture

Posts: 390

Date Joined: 09/03/12

Don't stop there

Wed, 2020-02-26 15:51

I've embarked on the stainless journey for my Ace trailer. I do one extra bit each year as I replace the brake pads (stainless) and bearings.

First I replaced all the brake lines with flexible stainless brake lines. The fittings into the brake calipers were completely corroded.

Then I fitted stainless brake calipers, the pistons etc on the old ones basically fell apart in my hands....just to respond to the question above.

Next I fitted stainless caliper holders, with stainless bolts replacing the old steel ones.

Then stainless rotors.

Now I only have one bit left.....the hubs.

It's an expensive job, but not too bad if you do one component at a time. I bought all my components from Transtyle Trailers on the east coast...I can recommend them