[DeTomaso] Brake Caliper Question

[forestg at att.net]

If you are talking about getting the pistons to retract bear in mind that the rears have a ratchet built in to take up wear so that the parking brake will work. To retract these pistons you have to rotate the piston 45 degrees to release the ratchet. If you are trying to extend the pistons and they wont move you have a problem either with crud or corrosion.
Forest

-------------- Original message ----------------------
From: "www.ProvaMo.com" <Pantera007 at sbcglobal.net>
>
> 
> How are you testing the piston movement?
> 
> If you use a large clamp and slowly turning, the piston should "eventually"
> move all the way into the caliper.  All the way means flush with the ring,
> and maybe a little more.  Slowly means it may take several minutes.  A
> little turn on the clamp at a time.  
> 
> But the hydraulics will resist movement.  And as the fluid backs up the pipe
> back into the master, the fluid may also possibly overflow the master
> cylinder reservoir (making a mess).  
> 
> The procedure in the ProvaMo repair manual cautions one to drain some fluid
> from the reservoir before compressing the piston fully back into the
> caliper.
> 
> Extra brake fluid gets there over time, as one checks the level and adds a
> little bit.  This is necessary to compensate as the brake pads are consumed,
> and the piston needs to travel further to maintain contact with the rotor,
> so the level in the master drops, and we add a little more.
> 
> Chuck
> 
> The pistons in my original brake calipers, when removed from the rotor, but
> with hydraulics attached , only move a limited amount. Could anything other
> than corrosion in the caliper be limiting their movement ?  Any suggestions
> for repair. Braking power on the car is not great.
> 
> Thanks, 
> 
> Hap
> # 3664
> _______________________________________________
> 
> Detomaso Forum Managed by POCA
> 
> Archive Search Engine Now Available at http://www.realbig.com/detomaso/
> 
> DeTomaso mailing list
> DeTomaso at list.realbig.com
> http://list.realbig.com/mailman/listinfo/detomaso
> 
> No virus found in this incoming message.
> Checked by AVG Free Edition. 
> Version: 7.5.488 / Virus Database: 269.14.13/1075 - Release Date: 10/17/2007
> 9:38 AM
>  
> 
> No virus found in this outgoing message.
> Checked by AVG Free Edition. 
> Version: 7.5.488 / Virus Database: 269.14.13/1075 - Release Date: 10/17/2007
> 9:38 AM
>  
> 
> _______________________________________________
> 
> Detomaso Forum Managed by POCA
> 
> Archive Search Engine Now Available at http://www.realbig.com/detomaso/
> 
> DeTomaso mailing list
> DeTomaso at list.realbig.com
> http://list.realbig.com/mailman/listinfo/detomaso