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MK



Member Since: 28 Aug 2008
Location: Santiago
Posts: 2414

Chile 2007 Defender 110 Puma 2.4 SW Chawton White
Did you replace them with Bri Whistle pistons? Puma 110" SW

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Earth first. Other planets later
Post #1010311 6th Oct 2023 3:36pm
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MK



Member Since: 28 Aug 2008
Location: Santiago
Posts: 2414

Chile 2007 Defender 110 Puma 2.4 SW Chawton White
So I splitted one front caliper and the part metioned below does not fit.


MK wrote:
dorsetsmith wrote:
17H8764L - BRAKE CALIPER INTERNAL SEALS RRC you will need there seal if you split them, not included in most rebuild kits Exclamation 6 QTY for both front and rear split rebuilds


So do these seals apply to let´s say Puma calipers?
 Puma 110" SW

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Earth first. Other planets later
Post #1010324 6th Oct 2023 5:24pm
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MalteseRover



Member Since: 02 Jul 2013
Location: Gozo
Posts: 137

Malta 
Hi.
In the process of full brake system rebuild. NOT sure how things really worked because 6 out of the 8 pistons i pushed out today were stuck.

I drilled a 4mm hole close to the edge and wiggled the drill toward the edge/lip and then inserted a flat screw driver and hammered it tight in the groove and spun them back and forth until they got a bit loose. that It was easy to remove them as I levered a bit on the screw driver as I twisted them back and forth.

The calipers were sand blasted with all ports plugged and pistons still in place to avoid dirt ingress. Primed with red lead, undercoated and given a coat of 2K gloss black.

The part of the caliper housing between the fluid seal and dust seal rusts and locks the piston. I will sand it with a fine sand paper and I will put S.S. pistons whilst applying plenty of either rubber grease or silicone grease between the two seals.

I have not removed the fluid seal yet. seems like the seal does not sit square against the piston. when i run my finger along the bore going out I can feel like a lip but if i slide my finger inwards there is no lip. i have read or watched a "Tool Box video" on youtube which noted it. it acts as a spring to help pop the piston inwards once brake is released. Any thoughts about this?


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Post #1044132 28th Aug 2024 3:02pm
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jst



Member Since: 14 Jan 2008
Location: Taunton
Posts: 8021

 2011 Defender 110 Puma 2.4 USW Stornoway Grey
I tend to push old pistons out when fitted to vehicle using brake pedal if need be plumbers pliers to rotate them too.

If still stuck which is unusual an angle grinder to make a slot then lever out.

When refitting inuse same method as retroconda, small bit of piston exposed and slide wiper and dust cover over piston and into position.

A large socket is also useful for pushing them down evenly into place if piston has gone too far.

In initial post there is a comment that pistons can't be pushed all the way home, I haven't found this or have misunderstood the para. Cheers

James
110 2012 XS Utility
130 2011 M57 bespoke Camper
90 2010 Hardtop
90 M57 1988 Hardtop
Post #1044167 28th Aug 2024 7:03pm
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blackwolf



Member Since: 03 Nov 2009
Location: South West England
Posts: 17363

United Kingdom 2007 Defender 110 Puma 2.4 DCPU Stornoway Grey
I've had to drill and tap a hole in the base of the piston and use a jackscrew to extract it before now.
Post #1044170 28th Aug 2024 7:11pm
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